diff --git a/src/frontend/numparam/general.h b/src/frontend/numparam/general.h
index d8cf2bf81..322f57b1a 100644
--- a/src/frontend/numparam/general.h
+++ b/src/frontend/numparam/general.h
@@ -11,7 +11,7 @@
 
 char *pscopy(SPICE_DSTRINGPTR s, const char *a, int i, int j);
 char *pscopy_up(SPICE_DSTRINGPTR s, const char *a, int i, int j);
-bool scopyd(SPICE_DSTRINGPTR a, SPICE_DSTRINGPTR b);
+void scopyd(SPICE_DSTRINGPTR a, SPICE_DSTRINGPTR b);
 void scopys(SPICE_DSTRINGPTR a, const char *b);
 void scopy_up(SPICE_DSTRINGPTR a, const char *str);
 void scopy_lower(SPICE_DSTRINGPTR a, const char *str);
diff --git a/src/frontend/numparam/mystring.c b/src/frontend/numparam/mystring.c
index 869d88bec..c7b4ca353 100644
--- a/src/frontend/numparam/mystring.c
+++ b/src/frontend/numparam/mystring.c
@@ -109,12 +109,11 @@ cadd(SPICE_DSTRINGPTR dstr_p, char c)
  * Create copy of the dynamic string.  Dynamic strings are always NULL
  * terminated.
  * ----------------------------------------------------------------- */
-bool
+void
 scopyd(SPICE_DSTRINGPTR s, SPICE_DSTRINGPTR t)  /* returns success flag */
 {
     spice_dstring_reinit(s);
     spice_dstring_append(s, spice_dstring_value(t), -1);
-    return 1; /* Dstrings expand to any length */
 }