diff --git a/src/syntax.c b/src/syntax.c
index d09359a..e945dac 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -10044,11 +10044,11 @@
 #ifdef USER_HIGHLIGHT
     char_u      userhl[10];
 # ifdef FEAT_STL_OPT
-    int		id_SNC = -1;
     int		id_S = -1;
+    int		id_SNC = 0;
 #  ifdef FEAT_TERMINAL
-    int		id_ST = -1;
-    int		id_STNC = -1;
+    int		id_ST = 0;
+    int		id_STNC = 0;
 #  endif
     int		hlcnt;
 # endif