diff --git a/Jenkinsfile b/Jenkinsfile
index 575a225..69f94df 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -8,7 +8,7 @@ pipeline {
     pollSCM("*/10 * * * *")
   }
   environment {
-    SONAR_SCANNER_VERSION=4.7.0.2747
+    SONAR_SCANNER_VERSION="4.7.0.2747"
     SONAR_SCANNER_HOME=$HOME/.sonar/sonar-scanner-$SONAR_SCANNER_VERSION-linux
     PATH=$SONAR_SCANNER_HOME/bin:$PATH
     SONAR_SCANNER_OPTS="-server"