diff --git a/vars/buildStep.groovy b/vars/buildStep.groovy
index f7a9fe7..3e65137 100644
--- a/vars/buildStep.groovy
+++ b/vars/buildStep.groovy
@@ -2,7 +2,7 @@
 
 def call(Map config = [:]) {
     echo "Hello, ${config.name}"
-    if (fileExists 'Makefile') {
+    if ( fileExists('Makefile')) {
         sh 'make'
     }
     echo 'Done'