diff --git a/cibuildwheel/linux.py b/cibuildwheel/linux.py
index 2df50c2e..49fe2afc 100644
--- a/cibuildwheel/linux.py
+++ b/cibuildwheel/linux.py
@@ -87,8 +87,8 @@ def build(project_dir, output_dir, test_command, test_requires, test_extras, bef
 
                 # Set up a virtual environment to install and test from, to make sure
                 # there are no dependencies that were pulled in at build time.
-                pip install virtualenv
-                virtualenv tmp-test-env
+                "$PYBIN/pip" install virtualenv
+                "$PYBIN/virtualenv" tmp-test-env
                 source tmp-test-env/bin/activate
 
                 # Check that we are using the Python from the virtual environment