diff --git a/src/message.c b/src/message.c
index 8eb9fc4..84b848d 100644
--- a/src/message.c
+++ b/src/message.c
@@ -15,7 +15,7 @@
         if (len < offset + sizeof(v)) { \
             goto done; \
         } else { \
-            memcpy((uint8_t *)message, &v, sizeof(v)); \
+            memcpy((uint8_t *)message + offset, &v, sizeof(v)); \
             offset += sizeof(v); \
         } \
         break; \
@@ -27,7 +27,7 @@
         if (len < offset + sizeof(v)) { \
             goto done; \
         } else { \
-            memcpy((uint8_t *)message, &v, sizeof(v)); \
+            memcpy((uint8_t *)message + offset, &v, sizeof(v)); \
             offset += sizeof(v); \
         } \
         break; \