diff --git a/docker/install/ubuntu_install_nnpack.sh b/docker/install/ubuntu_install_nnpack.sh
index 4f45f130e2e5..dc51fc28d492 100755
--- a/docker/install/ubuntu_install_nnpack.sh
+++ b/docker/install/ubuntu_install_nnpack.sh
@@ -6,9 +6,9 @@
 # to you under the Apache License, Version 2.0 (the
 # "License"); you may not use this file except in compliance
 # with the License.  You may obtain a copy of the License at
-# 
+#
 #   http://www.apache.org/licenses/LICENSE-2.0
-# 
+#
 # Unless required by applicable law or agreed to in writing,
 # software distributed under the License is distributed on an
 # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
@@ -22,11 +22,14 @@ set -o pipefail
 
 apt-get update && apt-get install -y --no-install-recommends git cmake
 
-# TODO: specific tag?
 git clone https://github.com/Maratyszcza/NNPACK NNPACK
+git clone https://github.com/Maratyszcza/pthreadpool  NNPACK/pthreadpool
+
+# Use specific versioning tag.
 (cd NNPACK && git checkout 1e005b0c2)
+(cd NNPACK/pthreadpool && git checkout 13da0b4c)
 
 mkdir -p NNPACK/build
 cd NNPACK/build
-cmake -DCMAKE_INSTALL_PREFIX:PATH=. -DNNPACK_INFERENCE_ONLY=OFF -DNNPACK_CONVOLUTION_ONLY=OFF -DNNPACK_BUILD_TESTS=OFF -DCMAKE_POSITION_INDEPENDENT_CODE=ON .. && make -j4 && make install
+cmake -DCMAKE_INSTALL_PREFIX:PATH=. -DNNPACK_INFERENCE_ONLY=OFF -DNNPACK_CONVOLUTION_ONLY=OFF -DNNPACK_BUILD_TESTS=OFF -DCMAKE_POSITION_INDEPENDENT_CODE=ON -DPTHREADPOOL_SOURCE_DIR=pthreadpool .. && make -j4 && make install
 cd -