diff --git a/src/main.cpp b/src/main.cpp
index 19ea3fef..3fb5c60b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -103,7 +103,7 @@ timesource_t timeSource = _unsynced;
 
 // container holding unique MAC address hashes with Memory Alloctor using PSRAM,
 // if present
-std::set<uint16_t, std::less<uint16_t>, Mallocator<uint16_t>> macs;
+DRAM_ATTR std::set<uint16_t, std::less<uint16_t>, Mallocator<uint16_t>> macs;
 
 // initialize payload encoder
 PayloadConvert payload(PAYLOAD_BUFFER_SIZE);