diff --git a/scripts/codesign_example.sh b/scripts/codesign_example.sh
index 14d7ed6ef..b7a93badc 100755
--- a/scripts/codesign_example.sh
+++ b/scripts/codesign_example.sh
@@ -156,6 +156,6 @@ signed_checksum=$(
     | grep -i "x-checksum-sha256" | awk 'gsub("[\r\n]", "", $2) {print $2;}'
 )
 
-echo "${signed_checksum}  signed_${SN_ID}.zip" | SHASUM_PROG -c
+echo "${signed_checksum}  signed_${SN_ID}.zip" | $SHASUM_PROG -c
 
 mv "signed_${SN_ID}.zip" "$TARGET_ZIP"
diff --git a/scripts/sign.sh b/scripts/sign.sh
index 850aa5d0e..e74ad70e3 100755
--- a/scripts/sign.sh
+++ b/scripts/sign.sh
@@ -8,6 +8,13 @@
 # export PRODUCT_NAME="packer"
 # export ARTIFACTORY_TOKEN=$ARTIFACTORY_TOKEN
 
+ARTIFACTORY_TOKEN="${ARTIFACTORY_TOKEN:-""}"
+
+if [ -z "$ARTIFACTORY_TOKEN" ]; then
+  echo "Missing required Artifactory credentials"
+  exit 1
+fi
+
 # Get the parent directory of where this script is.
 SOURCE="${BASH_SOURCE[0]}"
 while [ -h "$SOURCE" ] ; do SOURCE="$(readlink "$SOURCE")"; done
@@ -28,4 +35,4 @@ for DARWIN_BIN in $(find ./pkg/dist/*darwin_*.zip); do
   ./scripts/codesign_example.sh
 done
 
-exit 0
\ No newline at end of file
+exit 0