diff --git a/command/build/help.go b/command/build/help.go
index 07c247c23..65ec5eb65 100644
--- a/command/build/help.go
+++ b/command/build/help.go
@@ -10,6 +10,7 @@ Options:
 
   -debug                     Debug mode enabled for builds
   -force                     Force a build to continue if artifacts exist, deletes existing artifacts
+  -machine-readable          Machine-readable output
   -except=foo,bar,baz        Build all builds other than these
   -only=foo,bar,baz          Only build the given builds by name
   -var 'key=value'           Variable for templates, can be used multiple times.
diff --git a/packer.go b/packer.go
index aa53fe57d..c14d778f5 100644
--- a/packer.go
+++ b/packer.go
@@ -122,7 +122,7 @@ func main() {
 // to remove this flag.
 func extractMachineReadable(args []string) ([]string, bool) {
 	for i, arg := range args {
-		if arg == "--machine-readable" {
+		if arg == "-machine-readable" {
 			// We found it. Slice it out.
 			result := make([]string, len(args)-1)
 			copy(result, args[:i])
diff --git a/packer/environment.go b/packer/environment.go
index 4a14b48ed..1ef6c5c2a 100644
--- a/packer/environment.go
+++ b/packer/environment.go
@@ -301,7 +301,7 @@ func (e *coreEnvironment) printHelp() {
 	}
 
 	e.ui.Say("\nGlobally recognized options:")
-	e.ui.Say("    --machine-readable    Machine-readable output format.")
+	e.ui.Say("    -machine-readable    Machine-readable output format.")
 }
 
 // Returns the UI for the environment. The UI is the interface that should