diff --git a/src/include/ngspice/inpdefs.h b/src/include/ngspice/inpdefs.h
index 661e6a2a3..18bc92ca4 100644
--- a/src/include/ngspice/inpdefs.h
+++ b/src/include/ngspice/inpdefs.h
@@ -77,6 +77,7 @@ struct card_assoc {
 struct card {
     int linenum;
     int linenum_orig;
+    char* linesource;
     char *line;
     char *error;
     struct card *nextcard;