diff --git a/src/tls.c b/src/tls.c
index bd54de604..c0ca6c151 100644
--- a/src/tls.c
+++ b/src/tls.c
@@ -3143,7 +3143,7 @@ static word16 TLSX_SecureRenegotiation_Write(SecureRenegotiation* data,
         }
     }
 
-    output[0] = offset - 1;  /* info length - self */
+    output[0] = (byte)(offset - 1);  /* info length - self */
 
     return offset;
 }