diff --git a/tools/testing/selftests/wireguard/qemu/arch/powerpc64le.config b/tools/testing/selftests/wireguard/qemu/arch/powerpc64le.config
index 990c510a9cfa5f4e5ac279dd78cc79725c1a8d9e..f52f1e2bc7f64dba3c4d24d276fde663fed03909 100644
--- a/tools/testing/selftests/wireguard/qemu/arch/powerpc64le.config
+++ b/tools/testing/selftests/wireguard/qemu/arch/powerpc64le.config
@@ -10,3 +10,4 @@ CONFIG_CMDLINE_BOOL=y
 CONFIG_CMDLINE="console=hvc0 wg.success=hvc1"
 CONFIG_SECTION_MISMATCH_WARN_ONLY=y
 CONFIG_FRAME_WARN=1280
+CONFIG_THREAD_SHIFT=14