diff --git a/signal.c b/signal.c
index 8d9fe8e0e9..10d3249d91 100644
--- a/signal.c
+++ b/signal.c
@@ -453,6 +453,8 @@ static struct {
 
 #ifdef __dietlibc__
 #define sighandler_t sh_t
+#else
+#define sighandler_t ruby_sighandler_t
 #endif
 
 typedef RETSIGTYPE (*sighandler_t)(int);