diff --git a/src/libs/dxmt-0.60/src/d3d11/d3d11_context_impl.cpp b/src/libs/dxmt-0.60/src/d3d11/d3d11_context_impl.cpp
index b531efe17dc4..2b2c270f9a75 100644
--- a/src/libs/dxmt-0.60/src/d3d11/d3d11_context_impl.cpp
+++ b/src/libs/dxmt-0.60/src/d3d11/d3d11_context_impl.cpp
@@ -573,7 +573,7 @@ struct DXMT_DRAW_INDEXED_ARGUMENTS {
   uint32_t IndexCount;
   uint32_t InstanceCount;
   uint32_t StartIndex;
-  uint32_t BaseVertex;
+  int32_t BaseVertex;
   uint32_t StartInstance;
 };
 
@@ -5028,4 +5028,4 @@ class MTLD3D11CommandList : public ManagedDeviceChild<ID3D11CommandList> {
   uint64_t local_coherence = 0;
 };
 
-} // namespace dxmt
\ No newline at end of file
+} // namespace dxmt
diff --git a/src/libs/dxmt-0.60/src/winemetal/winemetal.h b/src/libs/dxmt-0.60/src/winemetal/winemetal.h
index f6804c0c32b9..ef05fbb73a7b 100644
--- a/src/libs/dxmt-0.60/src/winemetal/winemetal.h
+++ b/src/libs/dxmt-0.60/src/winemetal/winemetal.h
@@ -1178,7 +1178,7 @@ struct wmtcmd_render_draw_indexed {
   obj_handle_t index_buffer;
   uint64_t index_buffer_offset;
   uint32_t instance_count;
-  uint32_t base_vertex;
+  int32_t base_vertex;
   uint32_t base_instance;
 };
 
@@ -1723,4 +1723,4 @@ WINEMETAL_API obj_handle_t MTLDevice_newFence(obj_handle_t device);
 
 WINEMETAL_API obj_handle_t MTLDevice_newEvent(obj_handle_t device);
 
-#endif
\ No newline at end of file
+#endif