diff --git a/tools/testing/memblock/internal.h b/tools/testing/memblock/internal.h
index 94b52a8718b5..c2a492c05e0c 100644
--- a/tools/testing/memblock/internal.h
+++ b/tools/testing/memblock/internal.h
@@ -2,6 +2,13 @@
 #ifndef _MM_INTERNAL_H
 #define _MM_INTERNAL_H
 
+/*
+ * Enable memblock_dbg() messages
+ */
+#ifdef MEMBLOCK_DEBUG
+static int memblock_debug = 1;
+#endif
+
 struct page {};
 
 void memblock_free_pages(struct page *page, unsigned long pfn,