diff --git a/tox.ini b/tox.ini
index 3ee544538a09..89dc84d1758a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,6 +16,7 @@ setenv =
   QISKIT_TEST_CAPTURE_STREAMS=1
   QISKIT_PARALLEL=FALSE
 passenv = 
+  RUSTUP_TOOLCHAIN
   RAYON_NUM_THREADS
   OMP_NUM_THREADS
   QISKIT_PARALLEL