diff --git a/src/python/grpcio/grpc/_cython/imports.generated.h b/src/python/grpcio/grpc/_cython/imports.generated.h
index b3e341fe25e..f87c4da7878 100644
--- a/src/python/grpcio/grpc/_cython/imports.generated.h
+++ b/src/python/grpcio/grpc/_cython/imports.generated.h
@@ -470,7 +470,7 @@ extern grpc_byte_buffer_length_type grpc_byte_buffer_length_import;
 typedef void(*grpc_byte_buffer_destroy_type)(grpc_byte_buffer *byte_buffer);
 extern grpc_byte_buffer_destroy_type grpc_byte_buffer_destroy_import;
 #define grpc_byte_buffer_destroy grpc_byte_buffer_destroy_import
-typedef void(*grpc_byte_buffer_reader_init_type)(grpc_byte_buffer_reader *reader, grpc_byte_buffer *buffer);
+typedef int(*grpc_byte_buffer_reader_init_type)(grpc_byte_buffer_reader *reader, grpc_byte_buffer *buffer);
 extern grpc_byte_buffer_reader_init_type grpc_byte_buffer_reader_init_import;
 #define grpc_byte_buffer_reader_init grpc_byte_buffer_reader_init_import
 typedef void(*grpc_byte_buffer_reader_destroy_type)(grpc_byte_buffer_reader *reader);
diff --git a/src/ruby/ext/grpc/rb_grpc_imports.generated.h b/src/ruby/ext/grpc/rb_grpc_imports.generated.h
index 13f961495cf..6f0974e31b4 100644
--- a/src/ruby/ext/grpc/rb_grpc_imports.generated.h
+++ b/src/ruby/ext/grpc/rb_grpc_imports.generated.h
@@ -470,7 +470,7 @@ extern grpc_byte_buffer_length_type grpc_byte_buffer_length_import;
 typedef void(*grpc_byte_buffer_destroy_type)(grpc_byte_buffer *byte_buffer);
 extern grpc_byte_buffer_destroy_type grpc_byte_buffer_destroy_import;
 #define grpc_byte_buffer_destroy grpc_byte_buffer_destroy_import
-typedef void(*grpc_byte_buffer_reader_init_type)(grpc_byte_buffer_reader *reader, grpc_byte_buffer *buffer);
+typedef int(*grpc_byte_buffer_reader_init_type)(grpc_byte_buffer_reader *reader, grpc_byte_buffer *buffer);
 extern grpc_byte_buffer_reader_init_type grpc_byte_buffer_reader_init_import;
 #define grpc_byte_buffer_reader_init grpc_byte_buffer_reader_init_import
 typedef void(*grpc_byte_buffer_reader_destroy_type)(grpc_byte_buffer_reader *reader);