diff --git a/src/frontend/numparam/mystring.c b/src/frontend/numparam/mystring.c
index d0c8015eb..9cebee928 100644
--- a/src/frontend/numparam/mystring.c
+++ b/src/frontend/numparam/mystring.c
@@ -390,13 +390,6 @@ alfa(char c)
 }
 
 
-bool
-num(char c)
-{
-    return (c >= '0') && (c <= '9');
-}
-
-
 bool
 alfanum(char c)
 {
diff --git a/src/frontend/numparam/xpressn.c b/src/frontend/numparam/xpressn.c
index a861d18ad..49b751c98 100644
--- a/src/frontend/numparam/xpressn.c
+++ b/src/frontend/numparam/xpressn.c
@@ -1342,7 +1342,7 @@ getword(char *s, SPICE_DSTRINGPTR tstr_p, int after, int *pi)
 
     spice_dstring_reinit(tstr_p);
 
-    while ((i <= ls) && (alfa(s[i - 1]) || num(s[i - 1]))) {
+    while ((i <= ls) && (alfa(s[i - 1]) || isdigit_c(s[i - 1]))) {
         cadd(tstr_p, toupper_c(s[i - 1]));
         i++;
     }