diff --git a/src/search.c b/src/search.c
index de7bae8..db6d04c 100644
--- a/src/search.c
+++ b/src/search.c
@@ -451,8 +451,8 @@
     void
 set_last_csearch(c, s, len)
     int		c;
-    char_u	*s;
-    int		len;
+    char_u	*s UNUSED;
+    int		len UNUSED;
 {
     *lastc = c;
 #ifdef FEAT_MBYTE