diff --git a/tools/mtmd/mtmd-helper.cpp b/tools/mtmd/mtmd-helper.cpp
index f7b7022ea..1c4d93c70 100644
--- a/tools/mtmd/mtmd-helper.cpp
+++ b/tools/mtmd/mtmd-helper.cpp
@@ -14,6 +14,7 @@
 #include <algorithm>
 #include <cinttypes>
 #include <vector>
+#include <string.h>
 
 //#define MTMD_AUDIO_DEBUG