diff --git a/C/sysbits.c b/C/sysbits.c
index 317572f7e..f439df211 100755
--- a/C/sysbits.c
+++ b/C/sysbits.c
@@ -116,7 +116,7 @@ char yap_pwd[YAP_FILENAME_MAX];
 STD_PROTO (void exit, (int));
 
 #ifdef _WIN32
-static void
+void
 Yap_WinError(char *yap_error)
 {
   char msg[256];
diff --git a/H/Yapproto.h b/H/Yapproto.h
index 3f2101284..0cc5e3ac9 100644
--- a/H/Yapproto.h
+++ b/H/Yapproto.h
@@ -343,6 +343,7 @@ int	STD_PROTO(Yap_ProcessSIGINT,(void));
 double  STD_PROTO(Yap_random, (void));
 #ifdef _WIN32
 char	*STD_PROTO(Yap_RegistryGetString,(char *));
+void	STD_PROTO(Yap_WinError,(char *));
 #endif
 
 /* threads.c */