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-rw-r--r--ext/standard/file.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/standard/file.c b/ext/standard/file.c
index c952903463..8f0c5a6eb7 100644
--- a/ext/standard/file.c
+++ b/ext/standard/file.c
@@ -1714,7 +1714,7 @@ PHPAPI PHP_FUNCTION(fread)
# define _php_mblen(ptr, len) 1
#else
# if defined(_REENTRANT) && defined(HAVE_MBRLEN) && defined(HAVE_MBSTATE_T)
-# define _php_mblen(ptr, len) (ptr == NULL ? mbsinit(&BG(mblen_state)): (int)mbrlen(ptr, len, &BG(mblen_state)))
+# define _php_mblen(ptr, len) ((ptr) == NULL ? mbsinit(&BG(mblen_state)): (int)mbrlen(ptr, len, &BG(mblen_state)))
# else
# define _php_mblen(ptr, len) mblen(ptr, len)
# endif