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-rw-r--r--ext/standard/php_string.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/ext/standard/php_string.h b/ext/standard/php_string.h
index a02658dc63..b5cf8f3051 100644
--- a/ext/standard/php_string.h
+++ b/ext/standard/php_string.h
@@ -154,6 +154,9 @@ PHPAPI char *php_strerror(int errnum);
# define php_mblen(ptr, len) 1
# define php_mb_reset()
#elif defined(_REENTRANT) && defined(HAVE_MBRLEN) && defined(HAVE_MBSTATE_T)
+# ifdef PHP_WIN32
+# include <wchar.h>
+# endif
# define php_mblen(ptr, len) ((int) mbrlen(ptr, len, &BG(mblen_state)))
# define php_mb_reset() memset(&BG(mblen_state), 0, sizeof(BG(mblen_state)))
#else