diff --git a/pre_commit/languages/ruby.py b/pre_commit/languages/ruby.py
index 32682f52..d3896d90 100644
--- a/pre_commit/languages/ruby.py
+++ b/pre_commit/languages/ruby.py
@@ -22,6 +22,7 @@ def get_env_patch(venv, language_version):  # pragma: windows no cover
     patches = (
         ('GEM_HOME', os.path.join(venv, 'gems')),
         ('RBENV_ROOT', venv),
+        ('BUNDLE_IGNORE_CONFIG', '1'),
         ('PATH', (
             os.path.join(venv, 'gems', 'bin'), os.pathsep,
             os.path.join(venv, 'shims'), os.pathsep,