diff --git a/git_command.py b/git_command.py
index aecda0e..ea0053e 100644
--- a/git_command.py
+++ b/git_command.py
@@ -155,6 +155,8 @@
         gitdir = project.gitdir
 
     command = [GIT]
+    if 'http_proxy' in env and 'darwin' == sys.platform:
+      command.extend(['-c', 'http.proxy=' + env['http_proxy']])
     if bare:
       if gitdir:
         _setenv(env, GIT_DIR, gitdir)