Index: src/OFAdjacentArray.m
==================================================================
--- src/OFAdjacentArray.m
+++ src/OFAdjacentArray.m
@@ -284,10 +284,11 @@
 
 - (int)countByEnumeratingWithState: (OFFastEnumerationState *)state
 			   objects: (id *)objects
 			     count: (int)count_
 {
+	static unsigned long dummyMutations;
 	size_t count = _array.count;
 
 	if (count > INT_MAX)
 		/*
 		 * Use the implementation from OFArray, which is slower, but can
@@ -300,11 +301,11 @@
 	if (state->state >= count)
 		return 0;
 
 	state->state = (unsigned long)count;
 	state->itemsPtr = (id *)_array.items;
-	state->mutationsPtr = (unsigned long *)self;
+	state->mutationsPtr = &dummyMutations;
 
 	return (int)count;
 }
 
 #ifdef OF_HAVE_BLOCKS

Index: src/OFArray.m
==================================================================
--- src/OFArray.m
+++ src/OFArray.m
@@ -719,10 +719,11 @@
 
 - (int)countByEnumeratingWithState: (OFFastEnumerationState *)state
 			   objects: (id *)objects
 			     count: (int)count
 {
+	static unsigned long dummyMutations;
 	OFRange range = OFMakeRange(state->state, count);
 
 	if (range.length > SIZE_MAX - range.location)
 		@throw [OFOutOfRangeException exception];
 
@@ -734,11 +735,11 @@
 	if (range.location + range.length > ULONG_MAX)
 		@throw [OFOutOfRangeException exception];
 
 	state->state = (unsigned long)(range.location + range.length);
 	state->itemsPtr = objects;
-	state->mutationsPtr = (unsigned long *)self;
+	state->mutationsPtr = &dummyMutations;
 
 	return (int)range.length;
 }
 
 - (OFEnumerator *)objectEnumerator

Index: src/OFDictionary.m
==================================================================
--- src/OFDictionary.m
+++ src/OFDictionary.m
@@ -429,10 +429,11 @@
 
 - (int)countByEnumeratingWithState: (OFFastEnumerationState *)state
 			   objects: (id *)objects
 			     count: (int)count
 {
+	static unsigned long dummyMutations;
 	OFEnumerator *enumerator;
 	int i;
 
 	memcpy(&enumerator, state->extra, sizeof(enumerator));
 
@@ -440,11 +441,11 @@
 		enumerator = [self keyEnumerator];
 		memcpy(state->extra, &enumerator, sizeof(enumerator));
 	}
 
 	state->itemsPtr = objects;
-	state->mutationsPtr = (unsigned long *)self;
+	state->mutationsPtr = &dummyMutations;
 
 	for (i = 0; i < count; i++) {
 		id object = [enumerator nextObject];
 
 		if (object == nil)

Index: src/OFEnumerator.m
==================================================================
--- src/OFEnumerator.m
+++ src/OFEnumerator.m
@@ -59,14 +59,15 @@
 
 - (int)countByEnumeratingWithState: (OFFastEnumerationState *)state
 			   objects: (id *)objects
 			     count: (int)count
 {
+	static unsigned long dummyMutations;
 	int i;
 
 	state->itemsPtr = objects;
-	state->mutationsPtr = (unsigned long *)self;
+	state->mutationsPtr = &dummyMutations;
 
 	for (i = 0; i < count; i++) {
 		id object = [self nextObject];
 
 		if (object == nil)

Index: src/OFSet.m
==================================================================
--- src/OFSet.m
+++ src/OFSet.m
@@ -232,10 +232,11 @@
 
 - (int)countByEnumeratingWithState: (OFFastEnumerationState *)state
 			   objects: (id *)objects
 			     count: (int)count
 {
+	static unsigned long dummyMutations;
 	OFEnumerator *enumerator;
 	int i;
 
 	memcpy(&enumerator, state->extra, sizeof(enumerator));
 
@@ -243,11 +244,11 @@
 		enumerator = [self objectEnumerator];
 		memcpy(state->extra, &enumerator, sizeof(enumerator));
 	}
 
 	state->itemsPtr = objects;
-	state->mutationsPtr = (unsigned long *)self;
+	state->mutationsPtr = &dummyMutations;
 
 	for (i = 0; i < count; i++) {
 		id object = [enumerator nextObject];
 
 		if (object == nil)