diff --git a/include/ehs/Serializer.h b/include/ehs/Serializer.h
index 5234a41..594500a 100644
--- a/include/ehs/Serializer.h
+++ b/include/ehs/Serializer.h
@@ -396,7 +396,7 @@ namespace ehs
         }
 
 		template<typename T, typename O = UInt_64>
-		void WriteStr(const T* str, N inSize = 0)
+		void WriteStr(const T* str, const bool sizeKnown, N inSize = 0)
 		{
 			if (!inSize)
 				while (str[inSize])
@@ -424,7 +424,8 @@ namespace ehs
 				{
 					Util::Copy(&data[offset], &str[0], bSize);
 
-					*(T*)&data[offset + inSize] = 0;
+					if (!sizeKnown)
+						*(T*)&data[offset + inSize] = 0;
 				}
 				else
 				{
@@ -432,7 +433,8 @@ namespace ehs
 						for (N b = 0; b < sizeof(T); ++b)
 							data[offset + sizeof(T) * i + b] = ((Byte*)&str[i])[sizeof(T) - i - 1];
 
-					*(T*)&data[offset + bSize] = 0;
+					if (!sizeKnown)
+						*(T*)&data[offset + bSize] = 0;
 				}
 			}
 			else
@@ -443,13 +445,15 @@ namespace ehs
 						for (N b = 0; b < sizeof(T); ++b)
 							data[offset + sizeof(T) * i + b] = ((Byte*)&str[i])[sizeof(T) - i - 1];
 
-					*(T*)&data[offset + bSize] = 0;
+					if (!sizeKnown)
+						*(T*)&data[offset + bSize] = 0;
 				}
 				else
 				{
 					Util::Copy(&data[offset], &str[0], bSize);
 
-					*(T*)&data[offset + bSize] = 0;
+					if (!sizeKnown)
+						*(T*)&data[offset + bSize] = 0;
 				}
 			}