@@ -301,12 +301,12 @@
 	objc_autoreleasePoolPop(pool);
 }
 
 - (void)appendString: (OFString*)string
 {
-	return [self insertString: string
-			  atIndex: [self length]];
+	[self insertString: string
+		   atIndex: [self length]];
 }
 
 - (void)appendCharacters: (of_unichar_t*)characters
 		  length: (size_t)length
 {
@@ -393,12 +393,12 @@
 	}
 }
 
 - (void)prependString: (OFString*)string
 {
-	return [self insertString: string
-			  atIndex: 0];
+	[self insertString: string
+		   atIndex: 0];
 }
 
 - (void)reverse
 {
 	size_t i, j, length = [self length];