diff --git a/signal.c b/signal.c
index 66d98504de..54bb1760d3 100644
--- a/signal.c
+++ b/signal.c
@@ -920,6 +920,9 @@ ruby_abort(void)
 }
 
 #ifdef SIGSEGV
+
+NORETURN(static ruby_sigaction_t sigsegv);
+
 static RETSIGTYPE
 sigsegv(int sig SIGINFO_ARG)
 {