diff --git a/deps/grpc/grpc.gyp b/deps/grpc/grpc.gyp
index 06e11f368e..58583848de 100644
--- a/deps/grpc/grpc.gyp
+++ b/deps/grpc/grpc.gyp
@@ -45,7 +45,14 @@
           ],
         },
       }]
-    ]
+    ],
+    'configurations': {
+      'Release': {
+        'defines': [
+          'NDEBUG',
+        ],
+      },
+    },
   },
   'targets': [
     {