diff --git a/winsup/cygwin/include/cygwin/signal.h b/winsup/cygwin/include/cygwin/signal.h
index ac8d276fa..a73565c74 100644
--- a/winsup/cygwin/include/cygwin/signal.h
+++ b/winsup/cygwin/include/cygwin/signal.h
@@ -207,7 +207,7 @@ struct sigaction
 int sigwait (const sigset_t *, int *);
 int sigwaitinfo (const sigset_t *, siginfo_t *);
 int sighold (int);
-int sigqueue(pid_t, int, const union);
+int sigqueue(pid_t, int, const union sigval);
 int siginterrupt (int, int);
 #ifdef __cplusplus
 }