diff --git a/builder/qemu/step_type_boot_command.go b/builder/qemu/step_type_boot_command.go
index fc999429f..6138f6cdd 100644
--- a/builder/qemu/step_type_boot_command.go
+++ b/builder/qemu/step_type_boot_command.go
@@ -153,7 +153,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<leftAltOn>") {
 			keyCode = special["<leftAlt>"]
 			original = original[len("<leftAltOn>"):]
-			log.Printf("Special code '<leftAltOn>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<leftAltOn>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, true)
 			time.Sleep(time.Second / 10)
@@ -167,7 +167,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<leftCtrlOn>") {
 			keyCode = special["<leftCtrlOn>"]
 			original = original[len("<leftCtrlOn>"):]
-			log.Printf("Special code '<leftCtrlOn>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<leftCtrlOn>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, true)
 			time.Sleep(time.Second / 10)
@@ -181,7 +181,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<leftShiftOn>") {
 			keyCode = special["<leftShiftOn>"]
 			original = original[len("<leftShiftOn>"):]
-			log.Printf("Special code '<leftShiftOn>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<leftShiftOn>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, true)
 			time.Sleep(time.Second / 10)
@@ -195,7 +195,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<leftAltOff>") {
 			keyCode = special["<leftAltOff>"]
 			original = original[len("<leftAltOff>"):]
-			log.Printf("Special code '<leftAltOff>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<leftAltOff>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, false)
 			time.Sleep(time.Second / 10)
@@ -209,7 +209,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<leftCtrlOff>") {
 			keyCode = special["<leftCtrlOff>"]
 			original = original[len("<leftCtrlOff>"):]
-			log.Printf("Special code '<leftCtrlOff>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<leftCtrlOff>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, false)
 			time.Sleep(time.Second / 10)
@@ -223,7 +223,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<leftShiftOff>") {
 			keyCode = special["<leftShiftOff>"]
 			original = original[len("<leftShiftOff>"):]
-			log.Printf("Special code '<leftShiftOff>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<leftShiftOff>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, false)
 			time.Sleep(time.Second / 10)
@@ -237,7 +237,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<rightAltOn>") {
 			keyCode = special["<rightAltOn>"]
 			original = original[len("<rightAltOn>"):]
-			log.Printf("Special code '<rightAltOn>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<rightAltOn>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, true)
 			time.Sleep(time.Second / 10)
@@ -251,7 +251,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<rightCtrlOn>") {
 			keyCode = special["<rightCtrlOn>"]
 			original = original[len("<rightCtrlOn>"):]
-			log.Printf("Special code '<rightCtrlOn>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<rightCtrlOn>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, true)
 			time.Sleep(time.Second / 10)
@@ -265,7 +265,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<rightShiftOn>") {
 			keyCode = special["<rightShiftOn>"]
 			original = original[len("<rightShiftOn>"):]
-			log.Printf("Special code '<rightShiftOn>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<rightShiftOn>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, true)
 			time.Sleep(time.Second / 10)
@@ -279,7 +279,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<rightAltOff>") {
 			keyCode = special["<rightAltOff>"]
 			original = original[len("<rightAltOff>"):]
-			log.Printf("Special code '<rightAltOff>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<rightAltOff>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, false)
 			time.Sleep(time.Second / 10)
@@ -293,7 +293,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<rightCtrlOff>") {
 			keyCode = special["<rightCtrlOff>"]
 			original = original[len("<rightCtrlOff>"):]
-			log.Printf("Special code '<rightCtrlOff>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<rightCtrlOff>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, false)
 			time.Sleep(time.Second / 10)
@@ -307,7 +307,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<rightShiftOff>") {
 			keyCode = special["<rightShiftOff>"]
 			original = original[len("<rightShiftOff>"):]
-			log.Printf("Special code '<rightShiftOff>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<rightShiftOff>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, false)
 			time.Sleep(time.Second / 10)
diff --git a/builder/vmware/common/step_type_boot_command.go b/builder/vmware/common/step_type_boot_command.go
index b74dff32e..d68e809c7 100644
--- a/builder/vmware/common/step_type_boot_command.go
+++ b/builder/vmware/common/step_type_boot_command.go
@@ -176,7 +176,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<leftAltOn>") {
 			keyCode = special["<leftAlt>"]
 			original = original[len("<leftAltOn>"):]
-			log.Printf("Special code '<leftAltOn>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<leftAltOn>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, true)
 			time.Sleep(time.Second / 10)
@@ -187,7 +187,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<leftCtrlOn>") {
 			keyCode = special["<leftCtrlOn>"]
 			original = original[len("<leftCtrlOn>"):]
-			log.Printf("Special code '<leftCtrlOn>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<leftCtrlOn>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, true)
 			time.Sleep(time.Second / 10)
@@ -198,7 +198,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<leftShiftOn>") {
 			keyCode = special["<leftShiftOn>"]
 			original = original[len("<leftShiftOn>"):]
-			log.Printf("Special code '<leftShiftOn>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<leftShiftOn>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, true)
 			time.Sleep(time.Second / 10)
@@ -209,7 +209,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<leftAltOff>") {
 			keyCode = special["<leftAltOff>"]
 			original = original[len("<leftAltOff>"):]
-			log.Printf("Special code '<leftAltOff>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<leftAltOff>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, false)
 			time.Sleep(time.Second / 10)
@@ -220,7 +220,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<leftCtrlOff>") {
 			keyCode = special["<leftCtrlOff>"]
 			original = original[len("<leftCtrlOff>"):]
-			log.Printf("Special code '<leftCtrlOff>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<leftCtrlOff>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, false)
 			time.Sleep(time.Second / 10)
@@ -231,7 +231,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<leftShiftOff>") {
 			keyCode = special["<leftShiftOff>"]
 			original = original[len("<leftShiftOff>"):]
-			log.Printf("Special code '<leftShiftOff>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<leftShiftOff>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, false)
 			time.Sleep(time.Second / 10)
@@ -242,7 +242,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<rightAltOn>") {
 			keyCode = special["<rightAltOn>"]
 			original = original[len("<rightAltOn>"):]
-			log.Printf("Special code '<rightAltOn>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<rightAltOn>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, true)
 			time.Sleep(time.Second / 10)
@@ -253,7 +253,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<rightCtrlOn>") {
 			keyCode = special["<rightCtrlOn>"]
 			original = original[len("<rightCtrlOn>"):]
-			log.Printf("Special code '<rightCtrlOn>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<rightCtrlOn>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, true)
 			time.Sleep(time.Second / 10)
@@ -264,7 +264,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<rightShiftOn>") {
 			keyCode = special["<rightShiftOn>"]
 			original = original[len("<rightShiftOn>"):]
-			log.Printf("Special code '<rightShiftOn>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<rightShiftOn>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, true)
 			time.Sleep(time.Second / 10)
@@ -275,7 +275,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<rightAltOff>") {
 			keyCode = special["<rightAltOff>"]
 			original = original[len("<rightAltOff>"):]
-			log.Printf("Special code '<rightAltOff>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<rightAltOff>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, false)
 			time.Sleep(time.Second / 10)
@@ -286,7 +286,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<rightCtrlOff>") {
 			keyCode = special["<rightCtrlOff>"]
 			original = original[len("<rightCtrlOff>"):]
-			log.Printf("Special code '<rightCtrlOff>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<rightCtrlOff>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, false)
 			time.Sleep(time.Second / 10)
@@ -297,7 +297,7 @@ func vncSendString(c *vnc.ClientConn, original string) {
 		if strings.HasPrefix(original, "<rightShiftOff>") {
 			keyCode = special["<rightShiftOff>"]
 			original = original[len("<rightShiftOff>"):]
-			log.Printf("Special code '<rightShiftOff>' found, replacing with: %s", keyCode)
+			log.Printf("Special code '<rightShiftOff>' found, replacing with: %d", keyCode)
 
 			c.KeyEvent(keyCode, false)
 			time.Sleep(time.Second / 10)