Index: src/OFBlock.m
==================================================================
--- src/OFBlock.m
+++ src/OFBlock.m
@@ -105,31 +105,31 @@
 extern void __objc_exec_class(void*);
 
 /* Begin of ObjC module */
 static struct objc_abi_metaclass _NSConcreteStackBlock_metaclass = {
 	"OFBlock", "OFBlock", "OFStackBlock", 8, OBJC_CLASS_INFO_METACLASS,
-	sizeof(struct objc_class), NULL, NULL
+	sizeof(struct objc_abi_class), NULL, NULL
 };
 
 struct objc_abi_class _NSConcreteStackBlock = {
 	&_NSConcreteStackBlock_metaclass, "OFBlock", "OFStackBlock", 8,
 	OBJC_CLASS_INFO_CLASS, sizeof(of_block_literal_t), NULL, NULL
 };
 
 static struct objc_abi_metaclass _NSConcreteGlobalBlock_metaclass = {
 	"OFBlock", "OFBlock", "OFGlobalBlock", 8, OBJC_CLASS_INFO_METACLASS,
-	sizeof(struct objc_class), NULL, NULL
+	sizeof(struct objc_abi_class), NULL, NULL
 };
 
 struct objc_abi_class _NSConcreteGlobalBlock = {
 	&_NSConcreteGlobalBlock_metaclass, "OFBlock", "OFGlobalBlock",
 	8, OBJC_CLASS_INFO_CLASS, sizeof(of_block_literal_t), NULL, NULL
 };
 
 static struct objc_abi_metaclass _NSConcreteMallocBlock_metaclass = {
 	"OFBlock", "OFBlock", "OFMallocBlock", 8, OBJC_CLASS_INFO_METACLASS,
-	sizeof(struct objc_class), NULL, NULL
+	sizeof(struct objc_abi_class), NULL, NULL
 };
 
 struct objc_abi_class _NSConcreteMallocBlock = {
 	&_NSConcreteMallocBlock_metaclass, "OFBlock", "OFMallocBlock",
 	8, OBJC_CLASS_INFO_CLASS, sizeof(of_block_literal_t), NULL, NULL