diff --git a/packages/grpc-tools/build_binaries.sh b/packages/grpc-tools/build_binaries.sh
index 52b19f5c..2227e985 100755
--- a/packages/grpc-tools/build_binaries.sh
+++ b/packages/grpc-tools/build_binaries.sh
@@ -2,6 +2,8 @@
 
 set -e
 
+uname -a
+
 cd $(dirname $0)
 base=$(pwd)
 protobuf_base=$base/deps/protobuf
@@ -30,7 +32,7 @@ for arch in "${arch_list[@]}"; do
       toolchain_flag=-DCMAKE_TOOLCHAIN_FILE=linux_32bit.toolchain.cmake
       ;;
     *)
-      toolchain_flag=
+      toolchain_flag=-DCMAKE_TOOLCHAIN_FILE=linux_64bit.toolchain.cmake
       ;;
   esac
   rm -f $base/build/bin/protoc
@@ -39,6 +41,7 @@ for arch in "${arch_list[@]}"; do
   cmake $toolchain_flag . && cmake --build . --target clean && cmake --build . -- -j 12
   cp -L $protobuf_base/protoc $base/build/bin/protoc
   cp $base/grpc_node_plugin $base/build/bin/
+  file $base/build/bin/*
   cd $base/build
   tar -czf "$out_dir/$platform-$arch.tar.gz" bin/
   cd $base
diff --git a/packages/grpc-tools/linux_64bit.toolchain.cmake b/packages/grpc-tools/linux_64bit.toolchain.cmake
new file mode 100644
index 00000000..7a9b79a4
--- /dev/null
+++ b/packages/grpc-tools/linux_64bit.toolchain.cmake
@@ -0,0 +1,3 @@
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m64" CACHE STRING "c++ flags")
+set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -m64" CACHE STRING "c flags")
+set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m64" CACHE STRING "ld flags")
\ No newline at end of file
diff --git a/tools/release/kokoro-grpc-tools.sh b/tools/release/kokoro-grpc-tools.sh
index 1930a5a6..065c5951 100755
--- a/tools/release/kokoro-grpc-tools.sh
+++ b/tools/release/kokoro-grpc-tools.sh
@@ -6,6 +6,8 @@ OS=$(uname)
 
 git submodule update --init --recursive
 
+uname -a
+
 case $OS in
 Linux)
   docker build -t kokoro-native-image tools/release/native