1 files changed, 3 insertions, 2 deletions

diff --git a/src/sp_config_keywords.c b/src/sp_config_keywords.c
index b2e83fe..cbdd579 100644
--- a/src/sp_config_keywords.c
+++ b/src/sp_config_keywords.c
@@ -238,8 +238,9 @@ int parse_disabled_functions(char *line) {
 
   if (pos) {
     errno = 0;
-    df->pos = strtol(pos, NULL, 10) > 128 ? 128 : strtol(pos, NULL, 10);
-    if (errno != 0) {
+    char *endptr;
+    df->pos = strtol(pos, &endptr, 10) > 128 ? 128 : strtol(pos, NULL, 10);
+    if (errno != 0 || endptr == pos) {
       sp_log_err("config",
                  "Failed to parse arg '%s' of `pos` on line %zu.",
                  pos, sp_line_no);