diff --git a/core/src/main/java/software/sava/core/borsh/Borsh.java b/core/src/main/java/software/sava/core/borsh/Borsh.java
index 41df7e0..1d80941 100644
--- a/core/src/main/java/software/sava/core/borsh/Borsh.java
+++ b/core/src/main/java/software/sava/core/borsh/Borsh.java
@@ -1013,7 +1013,7 @@ static int write(final Borsh[][] array, final byte[] data, final int offset) {
   }
 
   static int write(final Borsh val, final byte[] data, final int offset) {
-    return 1 + val.write(data, offset + 1);
+    return val.write(data, offset);
   }
 
   static int len(final Borsh val) {
@@ -1030,7 +1030,7 @@ static int writeOptional(final Borsh val, final byte[] data, final int offset) {
       return 1;
     } else {
       data[offset] = (byte) 1;
-      return write(val, data, offset);
+      return 1 + write(val, data, offset + 1);
     }
   }
 }