1 files changed, 4 insertions, 1 deletions
diff --git a/toys/other/factor.c b/toys/other/factor.c
index bf454b44..570270ed 100644
--- a/toys/other/factor.c
+++ b/toys/other/factor.c
@@ -22,12 +22,15 @@ static void factor(char *s)
   long l, ll;
 
   for (;;) {
+    char *err = s;
+
     while(isspace(*s)) s++;
     if (!*s) return;
 
     l = strtol(s, &s, 0);
     if (*s && !isspace(*s)) {
-      error_msg("%s: not integer");
+      error_msg("%s: not integer", err);
+
       return;
     }