diff --git a/src/mesh/aes-ccm.cpp b/src/mesh/aes-ccm.cpp
index 8bc2989bf..a650ba2fc 100644
--- a/src/mesh/aes-ccm.cpp
+++ b/src/mesh/aes-ccm.cpp
@@ -18,12 +18,9 @@ static void WPA_PUT_BE16(uint8_t *a, uint16_t val)
 
 static void xor_aes_block(uint8_t *dst, const uint8_t *src)
 {
-    uint32_t *d = (uint32_t *)dst;
-    uint32_t *s = (uint32_t *)src;
-    *d++ ^= *s++;
-    *d++ ^= *s++;
-    *d++ ^= *s++;
-    *d++ ^= *s++;
+    for (uint8_t i = 0; i < AES_BLOCK_SIZE; i++) {
+        dst[i] ^= src[i];
+    }
 }
 static void aes_ccm_auth_start(size_t M, size_t L, const uint8_t *nonce, const uint8_t *aad, size_t aad_len, size_t plain_len,
                                uint8_t *x)