diff --git a/src/mesh/CryptoEngine.cpp b/src/mesh/CryptoEngine.cpp
index 9783f6255..bce9bb02f 100644
--- a/src/mesh/CryptoEngine.cpp
+++ b/src/mesh/CryptoEngine.cpp
@@ -32,6 +32,10 @@ void CryptoEngine::decrypt(uint32_t fromNode, uint64_t packetNum, size_t numByte
 void CryptoEngine::initNonce(uint32_t fromNode, uint64_t packetNum)
 {
     memset(nonce, 0, sizeof(nonce));
-    *((uint64_t *)&nonce[0]) = packetNum;
-    *((uint32_t *)&nonce[8]) = fromNode;
+
+    // use memcpy to avoid breaking strict-aliasing
+    memcpy(nonce, &packetNum, sizeof(uint64_t));
+    memcpy(nonce + sizeof(uint64_t), &fromNode, sizeof(uint32_t));
+    //*((uint64_t *)&nonce[0]) = packetNum;
+    //*((uint32_t *)&nonce[8]) = fromNode;
 }
\ No newline at end of file