diff --git a/support/testing/tests/package/test_python_sdbus_networkmanager.py b/support/testing/tests/package/test_python_sdbus_networkmanager.py
index a3961ec54f..c10f73920d 100644
--- a/support/testing/tests/package/test_python_sdbus_networkmanager.py
+++ b/support/testing/tests/package/test_python_sdbus_networkmanager.py
@@ -3,12 +3,21 @@ from tests.package.test_python import TestPythonPackageBase
 
 class TestPythonPy3SdbusNetworkmanager(TestPythonPackageBase):
     __test__ = True
-    config = TestPythonPackageBase.config + \
+    # Can't use TestPythonPackageBase.config because we need headers
+    # >= 4.20 for network-manager, so we have to use the bleeding-edge
+    # toolchain.
+    config = \
         """
+        BR2_arm=y
+        BR2_TOOLCHAIN_EXTERNAL=y
+        BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
+        BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_ARMV5_EABI_GLIBC_BLEEDING_EDGE=y
         BR2_PACKAGE_PYTHON3=y
         BR2_INIT_SYSTEMD=y
         BR2_PACKAGE_NETWORK_MANAGER=y
         BR2_PACKAGE_PYTHON_SDBUS_NETWORKMANAGER=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
         """
     sample_scripts = ["tests/package/sample_python_sdbus_networkmanager.py"]