diff --git a/src/backend/nococoa.m b/src/backend/nococoa.m
index c0e3c70..828f830 100644
--- a/src/backend/nococoa.m
+++ b/src/backend/nococoa.m
@@ -1,6 +1,6 @@
 #include <Mw/Milsko.h>
 
-void MwLLNoCocoaErrorMessage() {
+void MwLLNoCocoaErrorMessage(void) {
 	NSAlert* alert = [[NSAlert alloc] init];
 	[alert setMessageText:@"Milsko applications currently requires XQuartz or cocoa-way. PRs are welcome for anyone who wants to finish the Cocoa backend (prefarably in Objective-C)"];
 	[alert addButtonWithTitle:@"Ok"];
diff --git a/src/core.c b/src/core.c
index 1565963..3b322a4 100644
--- a/src/core.c
+++ b/src/core.c
@@ -989,8 +989,8 @@ int MwLibraryInit(void) {
 	}
 
 #ifdef __APPLE__
-	void MwNoCocoaErrorMessage();
-	MwNoCocoaErrorMessage();
+	void MwLLNoCocoaErrorMessage(void);
+	MwLLNoCocoaErrorMessage();
 #else
 	printf("[WARNING] No suitable GUI backend found! Enabled:"
 #ifdef USE_COCOA