diff --git a/script/ci.sh b/script/ci.sh
index 48231928..803d202b 100755
--- a/script/ci.sh
+++ b/script/ci.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 make compiler_specs
 out/Default/compiler_specs
 
diff --git a/tree_sitter.gyp b/tree_sitter.gyp
index 0feea7db..ea98a8dd 100644
--- a/tree_sitter.gyp
+++ b/tree_sitter.gyp
@@ -49,10 +49,12 @@
     },
   ],
   'target_defaults': {
+    'cflags_cc': [
+      '-std=c++0x',
+    ],
     'xcode_settings': {
       'ALWAYS_SEARCH_USER_PATHS': 'NO',
       'CLANG_CXX_LANGUAGE_STANDARD': 'c++0x',
-      'CLANG_CXX_LIBRARY': 'libc++',
     },
   },
 }