Index: src/OFBlock.m
==================================================================
--- src/OFBlock.m
+++ src/OFBlock.m
@@ -130,11 +130,11 @@
 		&_NSConcreteStackBlock, &_NSConcreteGlobalBlock,
 		&_NSConcreteMallocBlock, NULL
 	}
 };
 
-static struct objc_module module = {
+static struct _objc_module module = {
 	8, sizeof(module), NULL, (struct objc_symtab *)&symtab
 };
 
 OF_CONSTRUCTOR()
 {

Index: src/runtime/ObjFWRT.h
==================================================================
--- src/runtime/ObjFWRT.h
+++ src/runtime/ObjFWRT.h
@@ -700,12 +700,12 @@
  * Used by the compiler, but can also be called manually.
  *
  * These declarations are also required to prevent Clang's implicit
  * declarations which include __declspec(dllimport) on Windows.
  */
-struct objc_module;
-extern void __objc_exec_class(struct objc_module *_Nonnull module);
+struct _objc_module;
+extern void __objc_exec_class(struct _objc_module *_Nonnull module);
 extern IMP _Nonnull objc_msg_lookup(id _Nullable object, SEL _Nonnull selector);
 extern IMP _Nonnull objc_msg_lookup_stret(id _Nullable object,
     SEL _Nonnull selector);
 extern IMP _Nonnull objc_msg_lookup_super(struct objc_super *_Nonnull super,
     SEL _Nonnull selector);

Index: src/runtime/init.m
==================================================================
--- src/runtime/init.m
+++ src/runtime/init.m
@@ -21,11 +21,11 @@
 
 #import "ObjFWRT.h"
 #import "private.h"
 
 void
-__objc_exec_class(struct objc_module *module)
+__objc_exec_class(struct _objc_module *module)
 {
 	objc_globalMutex_lock();
 
 	objc_registerAllSelectors(module->symtab);
 	objc_registerAllClasses(module->symtab);

Index: src/runtime/private.h
==================================================================
--- src/runtime/private.h
+++ src/runtime/private.h
@@ -179,11 +179,11 @@
 	uint16_t classDefsCount;
 	uint16_t categoryDefsCount;
 	void *_Nonnull defs[1];
 };
 
-struct objc_module {
+struct _objc_module {
 	unsigned long version;	/* 9 = non-fragile */
 	unsigned long size;
 	const char *_Nullable name;
 	struct objc_symtab *_Nonnull symtab;
 };