diff --git a/src/frontend/inp.c b/src/frontend/inp.c
index 00ba77153..5ff2e0715 100644
--- a/src/frontend/inp.c
+++ b/src/frontend/inp.c
@@ -52,6 +52,7 @@ static struct line *com_options = NULL;
 static void cktislinear(CKTcircuit *ckt, struct line *deck);
 
 void line_free_x(struct line *deck, bool recurse);
+void com_circbyline(wordlist *wl);