Index: src/OFApplication.m
==================================================================
--- src/OFApplication.m
+++ src/OFApplication.m
@@ -38,11 +38,11 @@
 #endif
 
 static OFApplication *app = nil;
 
 static void
-atexit_handler()
+atexit_handler(void)
 {
 	id <OFApplicationDelegate> delegate = [app delegate];
 
 	[delegate applicationWillTerminate];
 }

Index: src/OFBlock.m
==================================================================
--- src/OFBlock.m
+++ src/OFBlock.m
@@ -121,11 +121,11 @@
 	const char *name;
 	void *symtab;
 } module = { 8, sizeof(module), NULL, &symtab };
 
 static void __attribute__((constructor))
-constructor()
+constructor(void)
 {
 	__objc_exec_class(&module);
 }
 /* End of ObjC module */
 #elif defined(OF_APPLE_RUNTIME) && !defined(__OBJC2__)

Index: src/OFDataArray.m
==================================================================
--- src/OFDataArray.m
+++ src/OFDataArray.m
@@ -32,11 +32,11 @@
 
 #import "base64.h"
 #import "macros.h"
 
 /* References for static linking */
-void _references_to_categories_of_OFDataArray()
+void _references_to_categories_of_OFDataArray(void)
 {
 	_OFDataArray_Hashing_reference = 1;
 };
 
 @implementation OFDataArray

Index: src/OFString.m
==================================================================
--- src/OFString.m
+++ src/OFString.m
@@ -52,11 +52,11 @@
 
 extern const uint16_t of_iso_8859_15[256];
 extern const uint16_t of_windows_1252[256];
 
 /* References for static linking */
-void _references_to_categories_of_OFString()
+void _references_to_categories_of_OFString(void)
 {
 	_OFString_Hashing_reference = 1;
 	_OFString_URLEncoding_reference = 1;
 	_OFString_XMLEscaping_reference = 1;
 	_OFString_XMLUnescaping_reference = 1;

Index: src/foundation-compat.m
==================================================================
--- src/foundation-compat.m
+++ src/foundation-compat.m
@@ -49,11 +49,11 @@
 
 	return self;
 }
 
 static void __attribute__((constructor))
-init()
+init(void)
 {
 	Class NSAutoreleasePool = objc_getClass("NSAutoreleasePool");
 	Class NSObject = objc_getClass("NSObject");
 	Method alloc_method;
 	Method addObject_method;

Index: src/objc_properties.m
==================================================================
--- src/objc_properties.m
+++ src/objc_properties.m
@@ -26,11 +26,11 @@
 # define SPINLOCK_HASH(p) ((uintptr_t)p >> 4) & (NUM_SPINLOCKS - 1)
 static of_spinlock_t spinlocks[NUM_SPINLOCKS];
 #endif
 
 BOOL
-objc_properties_init()
+objc_properties_init(void)
 {
 #ifdef OF_THREADS
 	size_t i;
 
 	for (i = 0; i < NUM_SPINLOCKS; i++)

Index: src/objc_sync.m
==================================================================
--- src/objc_sync.m
+++ src/objc_sync.m
@@ -47,11 +47,11 @@
 		    "condition!\n", f, __LINE__);			\
 		return 1;						\
 	}
 
 BOOL
-objc_sync_init()
+objc_sync_init(void)
 {
 	return of_mutex_new(&mutex);
 }
 
 int

Index: src/threading.h
==================================================================
--- src/threading.h
+++ src/threading.h
@@ -101,11 +101,11 @@
 	return YES;
 #endif
 }
 
 static OF_INLINE void
-of_thread_exit()
+of_thread_exit(void)
 {
 #if defined(OF_HAVE_PTHREADS)
 	pthread_exit(NULL);
 #elif defined(_WIN32)
 	ExitThread(0);