diff --git a/Jenkinsfile b/Jenkinsfile
index 62d2664f6..4f1d4b39a 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -38,6 +38,7 @@ pipeline {
 }
 
 def buildMacOS() {
+    def tasks = [:]
     tasks << getTasks(['mac'],['amd64'], {unused1, unused2 ->
         def myNode = {
             node ('mac') {