diff --git a/pre_commit/languages/node.py b/pre_commit/languages/node.py
index ec9da388..87312e84 100644
--- a/pre_commit/languages/node.py
+++ b/pre_commit/languages/node.py
@@ -45,9 +45,7 @@ def install_environment(repo_cmd_runner):
             python_env.run('nodeenv --jobs 4 {{prefix}}{0}'.format(NODE_ENV))
 
         with in_env(repo_cmd_runner) as node_env:
-            node_env.run(
-                'cd {0} && npm install -g'.format(repo_cmd_runner.prefix_dir),
-            )
+            node_env.run('cd {prefix} && npm install -g')
 
 
 def run_hook(repo_cmd_runner, hook, file_args):
diff --git a/pre_commit/languages/python.py b/pre_commit/languages/python.py
index 91d43b2e..14f2c935 100644
--- a/pre_commit/languages/python.py
+++ b/pre_commit/languages/python.py
@@ -27,7 +27,7 @@ def install_environment(repo_cmd_runner):
     # Install a virtualenv
     repo_cmd_runner.run(['virtualenv', '{{prefix}}{0}'.format(PY_ENV)])
     with in_env(repo_cmd_runner) as env:
-        env.run('cd {0} && pip install .'.format(repo_cmd_runner.prefix_dir))
+        env.run('cd {prefix} && pip install .')
 
 
 def run_hook(repo_cmd_runner, hook, file_args):
diff --git a/pre_commit/languages/ruby.py b/pre_commit/languages/ruby.py
index fcd3ad42..9d3ef26c 100644
--- a/pre_commit/languages/ruby.py
+++ b/pre_commit/languages/ruby.py
@@ -25,7 +25,7 @@ def install_environment(repo_cmd_runner):
 
     repo_cmd_runner.run(['__rvm-env.sh', '{{prefix}}{0}'.format(RVM_ENV)])
     with in_env(repo_cmd_runner) as env:
-        env.run('bundle install', cwd=repo_cmd_runner.prefix_dir)
+        env.run('cd {prefix} && bundle install')
 
 
 def run_hook(repo_cmd_runner, hook, file_args):