diff --git a/src/openrct2/ParkFile.cpp b/src/openrct2/ParkFile.cpp
index 4445f192a8..ebec01b35d 100644
--- a/src/openrct2/ParkFile.cpp
+++ b/src/openrct2/ParkFile.cpp
@@ -63,6 +63,7 @@ void ParkFile::Save(const std::string_view& path)
     WriteAuthoringChunk();
     WriteObjectsChunk();
     WriteGeneralChunk();
+    WriteTilesChunk();
 
     // TODO avoid copying the buffer
     auto uncompressedData = _buffer.str();
@@ -217,6 +218,22 @@ void ParkFile::WriteGeneralChunk()
     EndChunk();
 }
 
+void ParkFile::WriteTilesChunk()
+{
+    BeginChunk(ParkFileChunkType::TILES);
+    WriteValue<uint32_t>(gMapSize);
+    WriteValue<uint32_t>(gMapSize);
+    BeginArray();
+    auto numTiles = (size_t)gMapSize * gMapSize;
+    for (size_t i = 0; i < numTiles; i++)
+    {
+        WriteBuffer(&gTileElements[i], sizeof(gTileElements[i]));
+        NextArrayElement();
+    }
+    EndArray();
+    EndChunk();
+}
+
 enum : uint32_t
 {
     S6_SAVE_FLAG_EXPORT = 1 << 0,
diff --git a/src/openrct2/ParkFile.h b/src/openrct2/ParkFile.h
index 8e599b20ec..fb8bb24084 100644
--- a/src/openrct2/ParkFile.h
+++ b/src/openrct2/ParkFile.h
@@ -22,7 +22,7 @@ namespace OpenRCT2
             uint32_t NumChunks{};
             uint64_t UncompressedSize{};
             uint32_t Compression{};
-            std::array<uint8_t, 20> Sha1;
+            std::array<uint8_t, 20> Sha1{};
         };
 
         struct ChunkEntry
@@ -61,5 +61,6 @@ namespace OpenRCT2
         void WriteAuthoringChunk();
         void WriteObjectsChunk();
         void WriteGeneralChunk();
+        void WriteTilesChunk();
     };
 } // namespace OpenRCT2