diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1e8fd866c14..4179c5974a7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -121,6 +121,8 @@ jobs:
           for example_dir in examples/*; do
               tox --discover $(which python) -c $example_dir -e py
           done
+        env:
+          TOX_TESTENV_PASSENV: "CARGO_BUILD_TARGET"
 
     env:
       CARGO_BUILD_TARGET: ${{ matrix.platform.rust-target }}
diff --git a/examples/maturin_extension/tox.ini b/examples/maturin_extension/tox.ini
index 2d141ae5780..039ce10b389 100644
--- a/examples/maturin_extension/tox.ini
+++ b/examples/maturin_extension/tox.ini
@@ -3,7 +3,6 @@
 skipsdist = true
 
 [testenv]
-passenv = CARGO_BUILD_TARGET
 description = Run the unit tests under {basepython}
 deps = -rrequirements-dev.txt
 commands =
diff --git a/examples/setuptools_rust_extension/tox.ini b/examples/setuptools_rust_extension/tox.ini
index 36da3b17555..e0d45bbc7e4 100644
--- a/examples/setuptools_rust_extension/tox.ini
+++ b/examples/setuptools_rust_extension/tox.ini
@@ -3,7 +3,6 @@
 skipsdist = true
 
 [testenv]
-passenv = CARGO_BUILD_TARGET
 description = Run the unit tests under {basepython}
 deps = -rrequirements-dev.txt
 commands =
diff --git a/examples/word-count/tox.ini b/examples/word-count/tox.ini
index 9b8fd1ead31..60d70417ce3 100644
--- a/examples/word-count/tox.ini
+++ b/examples/word-count/tox.ini
@@ -3,7 +3,6 @@
 skipsdist=true
 
 [testenv]
-passenv = CARGO_BUILD_TARGET
 description = Run the unit tests under {basepython}
 deps = -rrequirements-dev.txt
 commands =