diff --git a/ext/native/thin3d/thin3d.h b/ext/native/thin3d/thin3d.h
index 6365d9d9c6..c07b6130b5 100644
--- a/ext/native/thin3d/thin3d.h
+++ b/ext/native/thin3d/thin3d.h
@@ -493,6 +493,8 @@ struct PipelineDesc {
 
 struct DeviceCaps {
 	GPUVendor vendor;
+	uint32_t deviceID;  // use caution!
+
 	DataFormat preferredDepthBufferFormat;
 	DataFormat preferredShadowMapFormatLow;
 	DataFormat preferredShadowMapFormatHigh;
diff --git a/ext/native/thin3d/thin3d_d3d11.cpp b/ext/native/thin3d/thin3d_d3d11.cpp
index e93abb4c7e..2d8fae57b3 100644
--- a/ext/native/thin3d/thin3d_d3d11.cpp
+++ b/ext/native/thin3d/thin3d_d3d11.cpp
@@ -267,6 +267,7 @@ D3D11DrawContext::D3D11DrawContext(ID3D11Device *device, ID3D11DeviceContext *de
 			default:
 				caps_.vendor = GPUVendor::VENDOR_UNKNOWN;
 			}
+			caps_.deviceID = desc.DeviceId;
 			adapter->Release();
 		}
 		dxgiDevice->Release();
diff --git a/ext/native/thin3d/thin3d_d3d9.cpp b/ext/native/thin3d/thin3d_d3d9.cpp
index 8273446d48..d5d4c45bcd 100644
--- a/ext/native/thin3d/thin3d_d3d9.cpp
+++ b/ext/native/thin3d/thin3d_d3d9.cpp
@@ -603,7 +603,7 @@ D3D9Context::D3D9Context(IDirect3D9 *d3d, IDirect3D9Ex *d3dEx, int adapterId, ID
 	} else {
 		strcpy(shadeLangVersion_, "N/A");
 	}
-
+	caps_.deviceID = identifier_.DeviceId;
 	caps_.multiViewport = false;
 	caps_.anisoSupported = true;
 	caps_.depthRangeMinusOneToOne = false;
diff --git a/ext/native/thin3d/thin3d_vulkan.cpp b/ext/native/thin3d/thin3d_vulkan.cpp
index 7277647eb2..1ff74d1d5a 100644
--- a/ext/native/thin3d/thin3d_vulkan.cpp
+++ b/ext/native/thin3d/thin3d_vulkan.cpp
@@ -791,6 +791,7 @@ VKContext::VKContext(VulkanContext *vulkan, bool splitSubmit)
 		bugs_.Infest(Bugs::DUAL_SOURCE_BLENDING_BROKEN);
 	}
 
+	caps_.deviceID = deviceProps.deviceID;
 	device_ = vulkan->GetDevice();
 
 	queue_ = vulkan->GetGraphicsQueue();