diff --git a/src/syntax.c b/src/syntax.c
index 56d69c6..a7b3084 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -3303,7 +3303,7 @@
 #endif
 
     rmp->rmm_maxcol = syn_buf->b_p_smc;
-    r = vim_regexec_multi(rmp, syn_win, syn_buf, lnum, col, NULL);
+    r = vim_regexec_multi(rmp, syn_win, syn_buf, lnum, col, NULL, NULL);
 
 #ifdef FEAT_PROFILE
     if (syn_time_on)