diff --git a/renderdoc/driver/shaders/dxbc/dxbc_container.cpp b/renderdoc/driver/shaders/dxbc/dxbc_container.cpp
index 1ad3fe8b2..024f6f319 100644
--- a/renderdoc/driver/shaders/dxbc/dxbc_container.cpp
+++ b/renderdoc/driver/shaders/dxbc/dxbc_container.cpp
@@ -743,6 +743,20 @@ void DXBCContainer::ReplaceChunk(bytebuf &ByteCode, uint32_t fourcc, const byte
       return;
     }
   }
+
+  uint32_t newOffs = uint32_t(ByteCode.size() + sizeof(uint32_t));
+  ByteCode.insert(sizeof(FileHeader) + header->numChunks * sizeof(uint32_t), (byte *)&newOffs,
+                  sizeof(newOffs));
+
+  for(uint32_t chunkIdx = 0; chunkIdx < header->numChunks; chunkIdx++)
+    chunkOffsets[chunkIdx] += sizeof(uint32_t);
+
+  ByteCode.append(replacement, size);
+
+  header->numChunks++;
+  header->fileLength = (uint32_t)ByteCode.size();
+
+  HashContainer(ByteCode.data(), ByteCode.size());
 }
 
 const byte *DXBCContainer::FindChunk(const bytebuf &ByteCode, uint32_t fourcc, size_t &size)