diff --git a/requirements.txt b/requirements.txt
index ea29c3168a..f127fdc75d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,5 +4,6 @@ requests>=2.4.0
 click>=6.2
 pyblake2>=0.9.3
 libusb1>=1.6.4
+construct>=2.9
 pip>=6
 typing>=3.0.0; python_version < '3.5'
diff --git a/setup.py b/setup.py
index 202b94a779..2ad32c9be0 100755
--- a/setup.py
+++ b/setup.py
@@ -20,6 +20,7 @@ install_requires = [
     'click>=6.2',
     'pyblake2>=0.9.3',
     'libusb1>=1.6.4',
+    'construct>=2.9',
 ]
 
 CWD = os.path.dirname(os.path.realpath(__file__))