diff --git a/build/fbcode_builder/docker_builder.py b/build/fbcode_builder/docker_builder.py
index aa251f8a4..5f5de5587 100644
--- a/build/fbcode_builder/docker_builder.py
+++ b/build/fbcode_builder/docker_builder.py
@@ -47,10 +47,12 @@ class DockerFBCodeBuilder(FBCodeBuilder):
             ShellQuoted('FROM {}'.format(self.option('os_image'))),
             # /bin/sh syntax is a pain
             ShellQuoted('SHELL ["/bin/bash", "-c"]'),
-        ] + self.install_debian_deps() + [self._change_user()]
-            + [self.workdir(self.option('prefix')),
-            self.create_python_venv(),
-            self.python_venv()])
+        ]
+            + self.install_debian_deps() + [self._change_user()]
+            + [self.workdir(self.option('prefix'))]
+            + self.create_python_venv()
+            + self.python_venv()
+        )
 
     def python_venv(self):
         # To both avoid calling venv activate on each RUN command AND to ensure
diff --git a/build/fbcode_builder/fbcode_builder.py b/build/fbcode_builder/fbcode_builder.py
index c9aa5adf2..f57980f36 100644
--- a/build/fbcode_builder/fbcode_builder.py
+++ b/build/fbcode_builder/fbcode_builder.py
@@ -183,6 +183,12 @@ class FBCodeBuilder(object):
         '''
         raise NotImplementedError
 
+    def python_deps(self):
+        return [
+            'wheel',
+            'cython==0.28.6',
+        ]
+
     def debian_deps(self):
         return [
             'autoconf-archive',
@@ -252,18 +258,23 @@ class FBCodeBuilder(object):
         return self.step('Install packages for Debian-based OS', actions)
 
     def create_python_venv(self):
-        action = []
+        actions = []
         if self.option("PYTHON_VENV", "OFF") == "ON":
-            action = self.run(ShellQuoted("python3 -m venv {p}").format(
-                p=path_join(self.option('prefix'), "venv")))
-        return(action)
+            actions.append(self.run(ShellQuoted("python3 -m venv {p}").format(
+                p=path_join(self.option('prefix'), "venv"))))
+        return(actions)
 
     def python_venv(self):
-        action = []
+        actions = []
         if self.option("PYTHON_VENV", "OFF") == "ON":
-            action = ShellQuoted("source {p}").format(
-                p=path_join(self.option('prefix'), "venv", "bin", "activate"))
-        return(action)
+            actions.append(ShellQuoted("source {p}").format(
+                p=path_join(self.option('prefix'), "venv", "bin", "activate")))
+
+            actions.append(self.run(
+                ShellQuoted("python3 -m pip install {deps}").format(
+                    deps=shell_join(' ', (ShellQuoted(dep) for dep in
+                        self.python_deps())))))
+        return(actions)
 
     def debian_ccache_setup_steps(self):
         return []  # It's ok to ship a renderer without ccache support.
diff --git a/build/fbcode_builder/shell_builder.py b/build/fbcode_builder/shell_builder.py
index 5bb41fe57..eb3cccd79 100644
--- a/build/fbcode_builder/shell_builder.py
+++ b/build/fbcode_builder/shell_builder.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env )python
 # Copyright (c) Facebook, Inc. and its affiliates.
 from __future__ import absolute_import
 from __future__ import division
@@ -51,7 +51,7 @@ class ShellFBCodeBuilder(FBCodeBuilder):
     def setup(self):
         steps = [
             ShellQuoted('set -exo pipefail'),
-        ] + [self.create_python_venv(), self.python_venv()]
+        ] + self.create_python_venv() + self.python_venv()
         if self.has_option('ccache_dir'):
             ccache_dir = self.option('ccache_dir')
             steps += [