diff --git a/src/openrct2/core/MemoryStream.cpp b/src/openrct2/core/MemoryStream.cpp
index d6dcfe75fe..9a7f66cd31 100644
--- a/src/openrct2/core/MemoryStream.cpp
+++ b/src/openrct2/core/MemoryStream.cpp
@@ -178,7 +178,9 @@ void MemoryStream::EnsureCapacity(size_t capacity)
             newCapacity *= 2;
         }
 
+        uint64 position = GetPosition();
         _dataCapacity = newCapacity;
-        Memory::Reallocate(_data, _dataCapacity);
+        _data = Memory::Reallocate(_data, _dataCapacity);
+        _position = (void *)((uintptr_t)_data + (uintptr_t)position);
     }
 }