@@ -27,10 +27,11 @@
 #import "OFXMLElement.h"
 #import "OFDataArray.h"
 
 #import "OFInvalidArgumentException.h"
 #import "OFOutOfRangeException.h"
+#import "OFUndefinedKeyException.h"
 
 static struct {
 	Class isa;
 } placeholder;
 
@@ -296,10 +297,33 @@
 		return [ret autorelease];
 	}
 
 	return [self objectForKey: key];
 }
+
+- (void)setValue: (id)value
+	  forKey: (OFString*)key
+{
+	if ([key hasPrefix: @"@"]) {
+		void *pool = objc_autoreleasePoolPush();
+
+		key = [key substringWithRange: of_range(1, [key length] - 1)];
+		[super setValue: value
+			 forKey: key];
+
+		objc_autoreleasePoolPop(pool);
+		return;
+	}
+
+	if (![self isKindOfClass: [OFMutableDictionary class]])
+		@throw [OFUndefinedKeyException exceptionWithObject: self
+								key: key
+							      value: value];
+
+	[(OFMutableDictionary*)self setObject: value
+				       forKey: key];
+}
 
 - (size_t)count
 {
 	OF_UNRECOGNIZED_SELECTOR
 }