diff --git a/.evergreen/scripts/kms_tester.py b/.evergreen/scripts/kms_tester.py
index 40fd65919d..f0438e4eef 100644
--- a/.evergreen/scripts/kms_tester.py
+++ b/.evergreen/scripts/kms_tester.py
@@ -30,7 +30,7 @@ def _setup_azure_vm(base_env: dict[str, str]) -> None:
     env["AZUREKMS_CMD"] = "tar xf mongo-python-driver.tgz"
     run_command(f"{azure_dir}/run-command.sh", env=env)
 
-    env["AZUREKMS_CMD"] = "bash .evergreen/just.sh setup-tests kms azure-remote"
+    env["AZUREKMS_CMD"] = "NO_EXT=1 bash .evergreen/just.sh setup-tests kms azure-remote"
     run_command(f"{azure_dir}/run-command.sh", env=env)
     LOGGER.info("Setting up Azure VM... done.")
 
@@ -47,7 +47,7 @@ def _setup_gcp_vm(base_env: dict[str, str]) -> None:
     env["GCPKMS_CMD"] = "tar xf mongo-python-driver.tgz"
     run_command(f"{gcp_dir}/run-command.sh", env=env)
 
-    env["GCPKMS_CMD"] = "bash ./.evergreen/just.sh setup-tests kms gcp-remote"
+    env["GCPKMS_CMD"] = "NO_EXT=1 bash ./.evergreen/just.sh setup-tests kms gcp-remote"
     run_command(f"{gcp_dir}/run-command.sh", env=env)
     LOGGER.info("Setting up GCP VM...")