diff --git a/evmap.c b/evmap.c
index fd884ebc..4b899f34 100644
--- a/evmap.c
+++ b/evmap.c
@@ -95,7 +95,7 @@ hashsocket(struct event_map_entry *e)
 	 * matter.  Our hashtable implementation really likes low-order bits,
 	 * though, so let's do the rotate-and-add trick. */
 	unsigned h = (unsigned) e->fd;
-	h += (h >> 2) | (h << 30);
+	h = (h >> 2) | (h << 30);
 	return h;
 }