diff --git a/packages/grpc-native-core/binding.gyp b/packages/grpc-native-core/binding.gyp
index 3e858e18..60b79626 100644
--- a/packages/grpc-native-core/binding.gyp
+++ b/packages/grpc-native-core/binding.gyp
@@ -92,7 +92,7 @@
       'GRPC_ARES=0',
       'GRPC_UV',
       'GRPC_NODE_VERSION="1.16.0-pre1"',
-      '_XOPEN_SOURCE=500'
+      '_XOPEN_SOURCE=700'
     ],
     'conditions': [
       ['grpc_gcov=="true"', {
diff --git a/packages/grpc-native-core/templates/binding.gyp.template b/packages/grpc-native-core/templates/binding.gyp.template
index a9ba8507..56dc446e 100644
--- a/packages/grpc-native-core/templates/binding.gyp.template
+++ b/packages/grpc-native-core/templates/binding.gyp.template
@@ -84,7 +84,7 @@
         'GRPC_ARES=0',
         'GRPC_UV',
         'GRPC_NODE_VERSION="${settings.get('node_version', settings.version)}"',
-        '_XOPEN_SOURCE=500'
+        '_XOPEN_SOURCE=700'
       ],
       'conditions': [
         ['grpc_gcov=="true"', {