diff --git a/src/include/port.h b/src/include/port.h
index 7db476d7b01..c029878c6be 100644
--- a/src/include/port.h
+++ b/src/include/port.h
@@ -547,8 +547,8 @@ extern int  pg_mkdir_p(char *path, int omode);
 #define pqsignal pqsignal_be
 #endif

-#define PG_SIG_DFL (pqsigfunc) SIG_DFL
-#define PG_SIG_IGN (pqsigfunc) SIG_IGN
+#define PG_SIG_DFL (pqsigfunc) (pg_funcptr_t) SIG_DFL
+#define PG_SIG_IGN (pqsigfunc) (pg_funcptr_t) SIG_IGN
 typedef void (*pqsigfunc) (SIGNAL_ARGS);
 extern void pqsignal(int signo, pqsigfunc func);