diff --git a/package/linux-tools/linux-tool-selftests.mk.in b/package/linux-tools/linux-tool-selftests.mk.in
index e29c7f59debd..0bcc47af0a3e 100644
--- a/package/linux-tools/linux-tool-selftests.mk.in
+++ b/package/linux-tools/linux-tool-selftests.mk.in
@@ -23,7 +23,8 @@ SELFTESTS_DEPENDENCIES = \
 
 SELFTESTS_MAKE_FLAGS = \
 	$(LINUX_MAKE_FLAGS) \
-	ARCH=$(SELFTESTS_ARCH)
+	ARCH=$(SELFTESTS_ARCH) \
+	KHDR_DIR=$(LINUX_DIR)/usr/include
 
 # O must be redefined here to overwrite the one used by Buildroot for
 # out of tree build. We build the selftests in $(LINUX_DIR)/tools/selftests and