@@ -121,10 +121,22 @@
 	if (self == [OFMutableArray class])
 		return (id)&placeholder;
 
 	return [super alloc];
 }
+
+- init
+{
+	if (isa == [OFMutableArray class]) {
+		Class c = isa;
+		[self release];
+		@throw [OFNotImplementedException newWithClass: c
+						      selector: _cmd];
+	}
+
+	return [super init];
+}
 
 - copy
 {
 	return [[OFArray alloc] initWithArray: self];
 }