diff --git a/deps/zlib/zlib.gyp b/deps/zlib/zlib.gyp
index 7d90d5c9fde..25bcc74a035 100644
--- a/deps/zlib/zlib.gyp
+++ b/deps/zlib/zlib.gyp
@@ -58,6 +58,7 @@
           'conditions': [
             ['OS!="win"', {
               'product_name': 'chrome_zlib',
+              'cflags!': [ '-ansi' ],
               'sources!': [
                 'contrib/minizip/iowin32.c'
               ],