1 files changed, 3 insertions, 1 deletions

diff --git a/include/string.h b/include/string.h
index 10d071a..c1c24bc 100644
--- a/include/string.h
+++ b/include/string.h
@@ -208,7 +208,9 @@ _FORTIFY_FN(stpncpy) char *stpncpy(char * _FORTIFY_POS0 __d, const char *__s,
 #if __has_builtin(__builtin___stpncpy_chk) && FORTIFY_USE_NATIVE_CHK
         return __builtin___stpncpy_chk(__d, __s, __n, __fh_bos(__d, 0));
 #else
-        __fh_size_t max_len_s = strnlen(__s, __n);
+        __fh_size_t max_len_s = strlen(__s);
+        if (max_len_s > __n)
+                max_len_s = __n;
         if (__fh_overlap(__d, max_len_s, __s, max_len_s))
                 __builtin_trap();