diff --git a/Foundation/CPArray.j b/Foundation/CPArray.j
index cb1103e9d..90a22a1ef 100755
--- a/Foundation/CPArray.j
+++ b/Foundation/CPArray.j
@@ -413,7 +413,7 @@ CPEnumerationReverse    = 1 << 1;
 */
 - (unsigned)indexOfObjectPassingTest:(Function)predicate
 {
-    return [self indexOfObjectWithOptions:CPEnumerationNormal passingTest:predicate context:nil];
+    return [self indexOfObjectWithOptions:CPEnumerationNormal passingTest:predicate context:undefined];
 }
 
 /*!
@@ -445,7 +445,7 @@ CPEnumerationReverse    = 1 << 1;
 */
 - (unsigned)indexOfObjectWithOptions:(CPEnumerationOptions)opts passingTest:(Function)predicate
 {
-    return [self indexOfObjectWithOptions:opts passingTest:predicate context:nil];
+    return [self indexOfObjectWithOptions:opts passingTest:predicate context:undefined];
 }    
 
 /*!