diff --git a/pre_commit/git.py b/pre_commit/git.py
index f0b50404..4849d7c6 100644
--- a/pre_commit/git.py
+++ b/pre_commit/git.py
@@ -29,7 +29,7 @@ def no_git_env():
     # GIT_INDEX_FILE: Causes 'error invalid object ...' during commit
     return {
         k: v for k, v in os.environ.items()
-        if not k.startswith('GIT_') or k in {'GIT_SSH'}
+        if not k.startswith('GIT_') or k in {'GIT_SSH', 'GIT_SSH_COMMAND'}
     }