diff --git a/rules/nonhermetic.bzl b/rules/nonhermetic.bzl
index cf925932002add..e98f3c03d9d037 100644
--- a/rules/nonhermetic.bzl
+++ b/rules/nonhermetic.bzl
@@ -5,6 +5,7 @@
 NONHERMETIC_ENV_VARS = [
     "HOME",
     "PATH",
+    "PYTHONUSERBASE",
     "XILINX_VIVADO",
     "XILINX_HLS",
     "XILINXD_LICENSE_FILE",