Index: src/OFMutableString.m
==================================================================
--- src/OFMutableString.m
+++ src/OFMutableString.m
@@ -131,11 +131,11 @@
 	[self freeMemory: s->cString];
 	s->cString = newCString;
 	s->cStringLength = newCStringLength;
 
 	/*
-	 * Even though cStringLength can change, length can not, therefore no
+	 * Even though cStringLength can change, length cannot, therefore no
 	 * need to change it.
 	 */
 }
 
 - (void)setToCString: (const char*)newCString

Index: src/OFSet_hashtable.m
==================================================================
--- src/OFSet_hashtable.m
+++ src/OFSet_hashtable.m
@@ -17,10 +17,12 @@
 #include "config.h"
 
 #define OF_SET_HASHTABLE_M
 
 #import "OFSet_hashtable.h"
+#import "OFMutableSet_hashtable.h"
+#import "OFCountedSet_hashtable.h"
 #import "OFMutableDictionary_hashtable.h"
 #import "OFArray.h"
 #import "OFString.h"
 #import "OFNumber.h"
 #import "OFXMLElement.h"
@@ -185,13 +187,13 @@
 
 - (BOOL)isEqual: (id)object
 {
 	OFSet_hashtable *otherSet;
 
-	if (![object isKindOfClass: [OFSet_hashtable class]] /*&&
+	if (![object isKindOfClass: [OFSet_hashtable class]] &&
 	    ![object isKindOfClass: [OFMutableSet_hashtable class]] &&
-	    ![object isKindOfClass: [OFCountedSet_hashtable class]]*/)
+	    ![object isKindOfClass: [OFCountedSet_hashtable class]])
 		return [super isEqual: object];
 
 	otherSet = object;
 
 	return [otherSet->dictionary isEqual: dictionary];