diff --git a/src/sst_mailbox.cpp b/src/sst_mailbox.cpp
index bd929d4..6024d6d 100644
--- a/src/sst_mailbox.cpp
+++ b/src/sst_mailbox.cpp
@@ -418,7 +418,7 @@
     {
         return GetLevelsInfo(pm).currentConfigTdpLevel();
     }
-    unsigned int numLevels() override
+    unsigned int maxLevel() override
     {
         return GetLevelsInfo(pm).configTdpLevels();
     }