diff --git a/src/include/ngspice/fteinp.h b/src/include/ngspice/fteinp.h
index 8d449c7ad..65f6faee5 100644
--- a/src/include/ngspice/fteinp.h
+++ b/src/include/ngspice/fteinp.h
@@ -21,6 +21,7 @@ struct line {
     char *li_error;
     struct line *li_next;
     struct line *li_actual;
+    struct nscope *level;
 } ;
 
 /* Listing types. */
diff --git a/src/include/ngspice/inpdefs.h b/src/include/ngspice/inpdefs.h
index b4623f77b..a5ee2649e 100644
--- a/src/include/ngspice/inpdefs.h
+++ b/src/include/ngspice/inpdefs.h
@@ -61,6 +61,17 @@ struct INPtables{
     GENmodel *defZmod;
 };
 
+struct nscope {
+    struct nscope *next;
+    struct line_assoc *subckts;
+};
+
+struct line_assoc {
+    const char *name;
+    struct line *line;
+    struct line_assoc *next;
+};
+
 struct card{
     int linenum;
     int linenum_orig;
@@ -68,6 +79,7 @@ struct card{
     char *error;
     card *nextcard;
     card *actualLine;
+    struct nscope *level;
 };
 
 /* structure used to save models in after they are read during pass 1 */