diff --git a/src/Pomme.h b/src/Pomme.h
index 616d72e..7cf3917 100644
--- a/src/Pomme.h
+++ b/src/Pomme.h
@@ -103,7 +103,7 @@ OSErr ResError(void);
 void UseResFile(short refNum);
 
 // Gets the file reference number of the current resource file.
-short CurResFile();
+short CurResFile(void);
 
 void CloseResFile(short refNum);