diff --git a/tools/unit-test-app/Makefile b/tools/unit-test-app/Makefile
index 5aef4f953..1217f7820 100644
--- a/tools/unit-test-app/Makefile
+++ b/tools/unit-test-app/Makefile
@@ -63,6 +63,8 @@ $(BINARIES_DIR)/%/$(PROJECT_NAME).bin: configs/%
 	rm -f $(BUILDS_DIR)/$*/sdkconfig
 	cat sdkconfig.defaults > $(BUILDS_DIR)/$*/sdkconfig.defaults
 	echo "" >> $(BUILDS_DIR)/$*/sdkconfig.defaults # in case there is no trailing newline in sdkconfig.defaults
+	cat sdkconfig.defaults.esp32 >> $(BUILDS_DIR)/$*/sdkconfig.defaults
+	echo "" >> $(BUILDS_DIR)/$*/sdkconfig.defaults
 	cat configs/$* >> $(BUILDS_DIR)/$*/sdkconfig.defaults
 
 	# Build, tweaking paths to sdkconfig and sdkconfig.defaults