diff --git a/src/xspice/enh/enhtrans.c b/src/xspice/enh/enhtrans.c
index 5e2bf8339..2eb23aa2a 100644
--- a/src/xspice/enh/enhtrans.c
+++ b/src/xspice/enh/enhtrans.c
@@ -124,6 +124,9 @@ ENHtranslate_poly(
         l1->linenum = d->linenum;
         l2->linenum = d->linenum;
 
+        l1->linesource = copy("internal");
+        l2->linesource = copy("internal");
+
         /* Create the translated cards */
         d->error = two2three_translate(d->line, &(l1->line), &(l2->line));