Index: src/OFMutableArray.m
==================================================================
--- src/OFMutableArray.m
+++ src/OFMutableArray.m
@@ -156,11 +156,11 @@
 	 atIndex: (size_t)index
 {
 	OFObject **objs = [array cArray];
 	size_t i, count = [array count];
 
-	if (nobjects > count)
+	if (nobjects > count - index)
 		@throw [OFOutOfRangeException newWithClass: isa];
 
 	for (i = index; i < count && i < index + nobjects; i++)
 		[objs[i] release];