diff --git a/libguile/scmsigs.c b/libguile/scmsigs.c
index 48c5cff3a..c0c995e28 100644
--- a/libguile/scmsigs.c
+++ b/libguile/scmsigs.c
@@ -450,7 +450,7 @@ scm_init_scmsigs ()
       */
 #ifdef HAVE_SIGINTERRUPT
       siginterrupt (i, 0);
-#elif defined SA_RESTART
+#elif defined(SA_RESTART)
       {
 	struct sigaction action;