Index: src/OFBlock.m
==================================================================
--- src/OFBlock.m
+++ src/OFBlock.m
@@ -115,12 +115,10 @@
 
 static struct objc_abi_module module = {
 	8, sizeof(module), NULL, (struct objc_abi_symtab*)&symtab
 };
 
-extern void __objc_exec_class(struct objc_abi_module*);
-
 OF_CONSTRUCTOR()
 {
 	__objc_exec_class(&module);
 }
 /* End of ObjC module */

Index: src/runtime/init.m
==================================================================
--- src/runtime/init.m
+++ src/runtime/init.m
@@ -18,12 +18,14 @@
 
 #import "runtime.h"
 #import "runtime-private.h"
 
 void
-__objc_exec_class(struct objc_abi_module *module)
+__objc_exec_class(void *module_)
 {
+	struct objc_abi_module *module = module_;
+
 	objc_global_mutex_lock();
 
 	objc_register_all_selectors(module->symtab);
 	objc_register_all_classes(module->symtab);
 	objc_register_all_categories(module->symtab);

Index: src/runtime/runtime-private.h
==================================================================
--- src/runtime/runtime-private.h
+++ src/runtime/runtime-private.h
@@ -154,11 +154,10 @@
 extern void objc_dtable_set(struct objc_dtable*, uint32_t, IMP);
 extern void objc_dtable_free(struct objc_dtable*);
 extern void objc_dtable_cleanup(void);
 extern void objc_init_static_instances(struct objc_abi_symtab*);
 extern void objc_forget_pending_static_instances(void);
-extern void __objc_exec_class(struct objc_abi_module*);
 #ifdef OF_HAVE_THREADS
 extern void objc_global_mutex_lock(void);
 extern void objc_global_mutex_unlock(void);
 extern void objc_global_mutex_free(void);
 #else

Index: src/runtime/runtime.h
==================================================================
--- src/runtime/runtime.h
+++ src/runtime/runtime.h
@@ -240,11 +240,11 @@
  *
  * These declarations are also required to prevent Clang's implicit
  * declarations which include __declspec(dllimport) on Windows.
  */
 struct objc_abi_module;
-extern void __objc_exec_class(struct objc_abi_module*);
+extern void __objc_exec_class(void*);
 extern IMP objc_msg_lookup(id, SEL);
 extern IMP objc_msg_lookup_stret(id, SEL);
 extern IMP objc_msg_lookup_super(struct objc_super*, SEL);
 extern IMP objc_msg_lookup_super_stret(struct objc_super*, SEL);
 extern void objc_exception_throw(id);