diff --git a/lib/strtok.c b/lib/strtok.c
index bb740037d933438802bf1344d3287b2ec808c21c..a1525df02fdef0e3e641b87206241d3f9c4ec7bb 100644
--- a/lib/strtok.c
+++ b/lib/strtok.c
@@ -43,7 +43,7 @@ Curl_strtok_r(char *ptr, const char *sep, char **end)
     char *start = ptr;
 
     /* set the end pointer to the first byte after the start */
-    *end = ptr + 1;
+    *end = start + 1;
 
     /* scan through the string to find where it ends, it ends on a
        null byte or a character that exists in the separator string */