@@ -24,10 +24,15 @@
 
 + (instancetype)HMACWithHashClass: (Class <OFCryptoHash>)class
 {
 	return [[[self alloc] initWithHashClass: class] autorelease];
 }
+
+- init
+{
+	OF_INVALID_INIT_METHOD
+}
 
 - initWithHashClass: (Class <OFCryptoHash>)class
 {
 	self = [super init];