diff --git a/Makefile b/Makefile
index b6643ae6bd6124c5bbf975e3af7b1501d4a9328d..7ea5c18e8ff872d7ae10a16b753395824976ee63 100644
--- a/Makefile
+++ b/Makefile
@@ -105,7 +105,7 @@ clean:
 	@rm -f $(OBJ_DIR)/* $(BIN_DIR)/*
 	@rm -Rf $(BT_ROOT)/lib
 	@rm -f $(BT_ROOT)/src/api/*.o
-	@rm -f $(BT_ROOT)/src/api/internal/*.o
+	@rm -f $(BT_ROOT)/src/api/internal/*/*.o
 	@rm -Rf $(BT_ROOT)/include
 
 .PHONY: clean