diff --git a/src/d3d9/d3d9_device.cpp b/src/d3d9/d3d9_device.cpp
index f18d837f..6a27b1de 100644
--- a/src/d3d9/d3d9_device.cpp
+++ b/src/d3d9/d3d9_device.cpp
@@ -4187,7 +4187,7 @@ namespace dxvk {
       }
     }
     else {
-      physSlice = mappedBuffer->getSliceHandle();
+      physSlice = pResource->GetMappedSlice(Subresource);
 
       if (!alloced || wasWrittenByGPU) {
         if (unlikely(wasWrittenByGPU)) {