diff --git a/builds/gyp/project.gyp b/builds/gyp/project.gyp
index 37130338..58c0a105 100644
--- a/builds/gyp/project.gyp
+++ b/builds/gyp/project.gyp
@@ -37,12 +37,18 @@
       [ 'OS=="mac"', {
         'defines': [
           'ZMQ_HAVE_OSX'
-        ]
+        ],
+        'xcode_settings': {
+          'GCC_ENABLE_CPP_RTTI': 'YES'
+        }
       }],
       [ 'OS=="linux"', {
         'defines': [
           'ZMQ_HAVE_LINUX'
         ],
+        'cflags_cc!': [
+          '-fno-rtti'
+        ],
         'libraries': [
           '-lpthread'
         ]