diff --git a/setup.py b/setup.py
index 9e487d8f21b..8841c2ad8b7 100644
--- a/setup.py
+++ b/setup.py
@@ -16,8 +16,11 @@
 from PyInstaller import (__version__ as version, is_linux, is_win, is_cygwin,
                          HOMEPATH, PLATFORM, compat)
 
-
-REQUIREMENTS = ['setuptools']
+REQUIREMENTS = [
+    'setuptools',
+    'pefile >= 2017.8.1',
+    'macholib >= 1.8',
+]
 # For Windows install PyWin32 if not already installed.
 if sys.platform.startswith('win'):
     # Windows support depends on pefile library.