diff --git a/src/frontend/inpcom.c b/src/frontend/inpcom.c
index 18b2992a9..6a4192909 100644
--- a/src/frontend/inpcom.c
+++ b/src/frontend/inpcom.c
@@ -195,6 +195,9 @@ extern void inp_probe(struct card* card);
 static void utf8_syntax_check(struct card *deck);
 #endif
 
+struct card* insert_new_line(
+    struct card* card, char* line, int linenum, int linenum_orig);
+
 struct inp_read_t {
     struct card *cc;
     int line_number;