diff --git a/src/syntax.c b/src/syntax.c
index 5d43ede..c023486 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -4460,8 +4460,8 @@
     current_syn_inc_tag = ++running_syn_inc_tag;
     prev_toplvl_grp = curbuf->b_syn_topgrp;
     curbuf->b_syn_topgrp = sgl_id;
-    if (source ? do_source(eap->arg, FALSE, FALSE) == FAIL
-				: source_runtime(eap->arg, DOSO_NONE) == FAIL)
+    if (source ? do_source(eap->arg, FALSE, DOSO_NONE) == FAIL
+				: source_runtime(eap->arg, TRUE) == FAIL)
 	EMSG2(_(e_notopen), eap->arg);
     curbuf->b_syn_topgrp = prev_toplvl_grp;
     current_syn_inc_tag = prev_syn_inc_tag;