diff --git a/core/src/main/java/hudson/Functions.java b/core/src/main/java/hudson/Functions.java
index ee85b07f56..0f40e25c3c 100644
--- a/core/src/main/java/hudson/Functions.java
+++ b/core/src/main/java/hudson/Functions.java
@@ -372,7 +372,7 @@ public class Functions {
      * Works like JSTL build-in size(x) function,
      * but handle null gracefully.
      */
-    public static int size(Object o) throws Exception {
+    public static int size2(Object o) throws Exception {
         if(o==null) return 0;
         return ASTSizeFunction.sizeOf(o);
     }
diff --git a/core/src/main/resources/lib/form/repeatable.jelly b/core/src/main/resources/lib/form/repeatable.jelly
index 0757352ddf..7efa054627 100644
--- a/core/src/main/resources/lib/form/repeatable.jelly
+++ b/core/src/main/resources/lib/form/repeatable.jelly
@@ -69,7 +69,7 @@
     <j:remove var="${var}" />
 
     <j:if test="${minimum}">
-      <j:forEach begin="${h.size(items)}" end="${minimum-1}" var="i">
+      <j:forEach begin="${h.size2(items)}" end="${minimum-1}" var="i">
         <div class="repeated-chunk">
           <d:invokeBody />
         </div>