diff --git a/S7.Net/Types/Struct.cs b/S7.Net/Types/Struct.cs
index 136638ac..8168e7b5 100644
--- a/S7.Net/Types/Struct.cs
+++ b/S7.Net/Types/Struct.cs
@@ -78,7 +78,7 @@ public static int GetStructSize(Type structType)
                         break;
                 }
             }
-            return (int)numBytes;
+            return (int)Math.Ceiling(numBytes); 
         }
 
         /// <summary>