diff --git a/wgpu-hal/src/dx12/command.rs b/wgpu-hal/src/dx12/command.rs
index ea059636e3..09cf07775e 100644
--- a/wgpu-hal/src/dx12/command.rs
+++ b/wgpu-hal/src/dx12/command.rs
@@ -107,7 +107,13 @@ impl super::CommandEncoder {
                 );
             }
         }
-        if let Some(root_index) = self.pass.layout.special_constants_root_index {
+        if let Some(root_index) = self
+            .pass
+            .layout
+            .special_constants
+            .as_ref()
+            .map(|sc| sc.root_index)
+        {
             let needs_update = match self.pass.root_elements[root_index as usize] {
                 super::RootElement::SpecialConstantBuffer {
                     first_vertex: other_vertex,
@@ -130,7 +136,13 @@ impl super::CommandEncoder {
     }
 
     fn prepare_dispatch(&mut self, count: [u32; 3]) {
-        if let Some(root_index) = self.pass.layout.special_constants_root_index {
+        if let Some(root_index) = self
+            .pass
+            .layout
+            .special_constants
+            .as_ref()
+            .map(|sc| sc.root_index)
+        {
             let needs_update = match self.pass.root_elements[root_index as usize] {
                 super::RootElement::SpecialConstantBuffer {
                     first_vertex,
@@ -230,7 +242,7 @@ impl super::CommandEncoder {
     }
 
     fn reset_signature(&mut self, layout: &super::PipelineLayoutShared) {
-        if let Some(root_index) = layout.special_constants_root_index {
+        if let Some(root_index) = layout.special_constants.as_ref().map(|sc| sc.root_index) {
             self.pass.root_elements[root_index as usize] =
                 super::RootElement::SpecialConstantBuffer {
                     first_vertex: 0,
@@ -1214,8 +1226,9 @@ impl crate::CommandEncoder for super::CommandEncoder {
         let cmd_signature = &self
             .pass
             .layout
-            .special_constants_cmd_signatures
+            .special_constants
             .as_ref()
+            .map(|sc| &sc.cmd_signatures)
             .unwrap_or_else(|| &self.shared.cmd_signatures)
             .dispatch;
         unsafe {
diff --git a/wgpu-hal/src/dx12/device.rs b/wgpu-hal/src/dx12/device.rs
index 8cd4c6374f..171e2a36be 100644
--- a/wgpu-hal/src/dx12/device.rs
+++ b/wgpu-hal/src/dx12/device.rs
@@ -1123,9 +1123,7 @@ impl crate::Device for super::Device {
         }
         .into_device_result("Root signature creation")?;
 
-        let special_constants_cmd_signatures = if let Some(root_index) =
-            special_constants_root_index
-        {
+        let special_constants = if let Some(root_index) = special_constants_root_index {
             let constant_indirect_argument_desc = Direct3D12::D3D12_INDIRECT_ARGUMENT_DESC {
                 Type: Direct3D12::D3D12_INDIRECT_ARGUMENT_TYPE_CONSTANT,
                 Anonymous: Direct3D12::D3D12_INDIRECT_ARGUMENT_DESC_0 {
@@ -1153,7 +1151,7 @@ impl crate::Device for super::Device {
                 };
                 size_of_val(&first_vertex) + size_of_val(&first_instance) + size_of_val(&other)
             };
-            Some(super::CommandSignatures {
+            let cmd_signatures = super::CommandSignatures {
                 draw: Self::create_command_signature(
                     &self.raw,
                     Some(&raw),
@@ -1193,6 +1191,11 @@ impl crate::Device for super::Device {
                     ],
                     0,
                 )?,
+            };
+
+            Some(super::PipelineLayoutSpecialConstants {
+                root_index,
+                cmd_signatures,
             })
         } else {
             None
@@ -1209,8 +1212,7 @@ impl crate::Device for super::Device {
             shared: super::PipelineLayoutShared {
                 signature: Some(raw),
                 total_root_elements: parameters.len() as super::RootIndex,
-                special_constants_root_index,
-                special_constants_cmd_signatures,
+                special_constants,
                 root_constant_info,
             },
             bind_group_infos,
diff --git a/wgpu-hal/src/dx12/mod.rs b/wgpu-hal/src/dx12/mod.rs
index dc2faef32b..a91e4836d9 100644
--- a/wgpu-hal/src/dx12/mod.rs
+++ b/wgpu-hal/src/dx12/mod.rs
@@ -671,8 +671,7 @@ impl PassState {
             layout: PipelineLayoutShared {
                 signature: None,
                 total_root_elements: 0,
-                special_constants_root_index: None,
-                special_constants_cmd_signatures: None,
+                special_constants: None,
                 root_constant_info: None,
             },
             root_elements: [RootElement::Empty; MAX_ROOT_ELEMENTS],
@@ -909,14 +908,22 @@ struct RootConstantInfo {
 struct PipelineLayoutShared {
     signature: Option<Direct3D12::ID3D12RootSignature>,
     total_root_elements: RootIndex,
-    special_constants_root_index: Option<RootIndex>,
-    special_constants_cmd_signatures: Option<CommandSignatures>,
+    special_constants: Option<PipelineLayoutSpecialConstants>,
     root_constant_info: Option<RootConstantInfo>,
 }
 
 unsafe impl Send for PipelineLayoutShared {}
 unsafe impl Sync for PipelineLayoutShared {}
 
+#[derive(Debug, Clone)]
+struct PipelineLayoutSpecialConstants {
+    root_index: RootIndex,
+    cmd_signatures: CommandSignatures,
+}
+
+unsafe impl Send for PipelineLayoutSpecialConstants {}
+unsafe impl Sync for PipelineLayoutSpecialConstants {}
+
 #[derive(Debug)]
 pub struct PipelineLayout {
     shared: PipelineLayoutShared,