diff --git a/setter/src/unix/darwin/darwin.h b/setter/src/unix/darwin/darwin.h
index 244370f..5c2db0a 100644
--- a/setter/src/unix/darwin/darwin.h
+++ b/setter/src/unix/darwin/darwin.h
@@ -7,7 +7,7 @@
 
 #include <sys/types.h>
 
-void DarwinGetOsInfo();
+void DarwinGetOsInfo(void);
 void DarwinPrintStatfsFlags(u_int32_t flags);
 void DarwinResourceFork(const char* path);
 void DarwinFileAttributes(const char* path);