diff --git a/src/frontend/numparam/numpaif.h b/src/frontend/numparam/numpaif.h
index 9cf8222c3..935ea1783 100644
--- a/src/frontend/numparam/numpaif.h
+++ b/src/frontend/numparam/numpaif.h
@@ -13,7 +13,7 @@
 
 struct card;
 
-extern char  *nupa_copy(char *s, int linenum);
+extern char  *nupa_copy(struct card *c);
 extern int    nupa_eval(struct card *card);
 extern int    nupa_signal(int sig, char *info);
 extern void   nupa_scan(char * s, int linenum, int is_subckt);
diff --git a/src/frontend/numparam/spicenum.c b/src/frontend/numparam/spicenum.c
index ff21a85ca..8d0a0883f 100644
--- a/src/frontend/numparam/spicenum.c
+++ b/src/frontend/numparam/spicenum.c
@@ -730,7 +730,7 @@ nupa_copy_inst_dico(void)
 
 
 char *
-nupa_copy(char *s, int linenum)
+nupa_copy(struct card *deck)
 /* returns a copy (not quite) of s in freshly allocated memory.
    linenum, for info only, is the source line number.
    origin pointer s is kept, memory is freed later in nupa_done.
@@ -744,6 +744,9 @@ nupa_copy(char *s, int linenum)
    - substitute placeholders for all {..} --> 10-digit numeric values.
 */
 {
+    char * const s = deck->line;
+    const int linenum = deck->linenum;
+
     char *t;
     int ls;
     char c, d;
@@ -762,7 +765,7 @@ nupa_copy(char *s, int linenum)
 
     if ((!inexpansionS) && (linenum >= 0) && (linenum <= dynmaxline)) {
         linecountS++;
-        dicoS->dynrefptr[linenum] = s;
+        dicoS->dynrefptr[linenum] = deck->line;
         c = transform(dicoS, &u, incontrolS, &keywd);
         if (c == 'C')
             incontrolS = 1;
diff --git a/src/frontend/subckt.c b/src/frontend/subckt.c
index e1b81ba89..931cbd922 100644
--- a/src/frontend/subckt.c
+++ b/src/frontend/subckt.c
@@ -242,7 +242,7 @@ inp_subcktexpand(struct card *deck) {
         }
         /* now copy instances */
         for (c = deck; c; c = c->nextcard)  /* first Numparam pass */
-            c->line = nupa_copy(c->line, c->linenum);
+            c->line = nupa_copy(c);
 
 #ifdef TRACE
         fprintf(stderr, "Numparams transformed deck:\n");