diff --git a/src/collection-traversing.js b/src/collection-traversing.js
index 7e11d22d4..b2c1c2bf9 100644
--- a/src/collection-traversing.js
+++ b/src/collection-traversing.js
@@ -161,7 +161,7 @@
 
       for( var i = 0; i < this.length; i++ ){
         var ele = this[i];
-        var source = ele._private[ params.attr ];
+        var src = ele._private[ params.attr ];
 
         if( src ){
           sources.push( src );
@@ -304,4 +304,4 @@
   }
 
   
-})( cytoscape );
\ No newline at end of file
+})( cytoscape );