diff --git a/libs/util/sys.c b/libs/util/sys.c
index 5d1cf1e6b..e9cf01042 100644
--- a/libs/util/sys.c
+++ b/libs/util/sys.c
@@ -658,7 +658,7 @@ aiee (int sig)
 static void
 signal_handler (int sig)
 {
-	int         recover = 0;
+	int volatile recover = 0;	// volatile for longjump
 
 	printf ("Received signal %d, exiting...\n", sig);