diff --git a/src/Mesh.cpp b/src/Mesh.cpp
index 0a0fd769..e309685e 100644
--- a/src/Mesh.cpp
+++ b/src/Mesh.cpp
@@ -228,13 +228,16 @@ DispatcherAction Mesh::onRecvPacket(Packet* pkt) {
         // check that signature is valid
         bool is_ok;
         {
-          uint8_t message[PUB_KEY_SIZE + 4 + MAX_ADVERT_DATA_SIZE];
+          static uint8_t message[PUB_KEY_SIZE + 4 + MAX_ADVERT_DATA_SIZE];
           int msg_len = 0;
           memcpy(&message[msg_len], id.pub_key, PUB_KEY_SIZE); msg_len += PUB_KEY_SIZE;
           memcpy(&message[msg_len], &timestamp, 4); msg_len += 4;
           memcpy(&message[msg_len], app_data, app_data_len); msg_len += app_data_len;
 
-          is_ok = id.verify(signature, message, msg_len);
+          static uint8_t sig_copy[SIGNATURE_SIZE];
+          memcpy(sig_copy, signature, SIGNATURE_SIZE);
+
+          is_ok = id.verify(sig_copy, message, msg_len);
         }
         if (is_ok) {
           MESH_DEBUG_PRINTLN("%s Mesh::onRecvPacket(): valid advertisement received!", getLogDateTime());