diff --git a/libraries/Update/src/Updater.cpp b/libraries/Update/src/Updater.cpp
index 80538a5eae2..b519b76c380 100644
--- a/libraries/Update/src/Updater.cpp
+++ b/libraries/Update/src/Updater.cpp
@@ -278,6 +278,7 @@ bool UpdateClass::setMD5(const char * expected_md5){
         return false;
     }
     _target_md5 = expected_md5;
+    _target_md5.toLowerCase();
     return true;
 }