diff --git a/Jenkinsfile b/Jenkinsfile
index 2ee1dab..2e6c6c2 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -7,8 +7,8 @@ pipeline {
                 dotnetPack(outputDirectory: "./", project: "nugettest/")
                 sh """
                     files=( ./*.nupkg)
-                    fullfilename=$(basename -- ${files[0]})
-                    noext=${fullfilename%.*}
+                    fullfilename=\$(basename -- \${files[0]})
+                    noext=\${fullfilename%.*}
 
                     mv fullfilename $noext-$BUILD_NUMBER.nupkg