diff --git a/libraries/libldap/url.c b/libraries/libldap/url.c
index 48b8f7b30d..5dc0b7038f 100644
--- a/libraries/libldap/url.c
+++ b/libraries/libldap/url.c
@@ -286,6 +286,7 @@ static int hex_escape( char *buf, const char *s, int list )
 		}
 	}
 
+	buf[pos] = '\0';
 	return pos;
 }