diff --git a/source4/heimdal/lib/com_err/error.c b/source4/heimdal/lib/com_err/error.c
index 6864e870a41..bf046da2255 100644
--- a/source4/heimdal/lib/com_err/error.c
+++ b/source4/heimdal/lib/com_err/error.c
@@ -65,7 +65,7 @@ com_right_r(struct et_list *list, long code, char *str, size_t len)
 	    const char *msg = p->table->msgs[code - p->table->base];
 #ifdef LIBINTL
 	    char domain[12 + 20];
-	    snprintf(domain, sizeof(domain), "heim_com_err%d", p->table->base);
+	    snprintf(domain, sizeof(domain), "heim_com_err%ld", p->table->base);
 #endif
 	    strlcpy(str, dgettext(domain, msg), len);
 	    return str;