diff --git a/tools/testing/selftests/powerpc/security/Makefile b/tools/testing/selftests/powerpc/security/Makefile
index 44690f1bb26a..85861c46b445 100644
--- a/tools/testing/selftests/powerpc/security/Makefile
+++ b/tools/testing/selftests/powerpc/security/Makefile
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0+
 
 TEST_GEN_PROGS := rfi_flush
+top_srcdir = ../../../../..
 
 CFLAGS += -I../../../../../usr/include