macos objC build error
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index f3e7dd1..7ad6812 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -972,8 +972,8 @@
ss.dependency "#{s.name}/Implementation", version
ss.dependency "#{s.name}/Cronet-Interface", version
- ss.source_files = 'src/core/ext/transport/cronet/client/secure/cronet_channel_create.c',
- 'src/core/ext/transport/cronet/transport/cronet_transport.{c,h}',
+ ss.source_files = 'src/core/ext/transport/cronet/client/secure/cronet_channel_create.cc',
+ 'src/core/ext/transport/cronet/transport/cronet_transport.{cc,h}',
'third_party/objective_c/Cronet/bidirectional_stream_c.h'
end