diff --git a/renderdoc/driver/d3d12/d3d12_manager.h b/renderdoc/driver/d3d12/d3d12_manager.h
index 95c636cc3..fc6667c42 100644
--- a/renderdoc/driver/d3d12/d3d12_manager.h
+++ b/renderdoc/driver/d3d12/d3d12_manager.h
@@ -1222,6 +1222,6 @@ private:
   D3D12GpuBufferAllocator m_GPUBufferAllocator;
 
   // dummy handle to use - starting from near highest valid pointer to minimise risk of overlap with real handles
-  static const uint64_t FirstDummyHandle = INTPTR_MAX - 1024;
+  static const uint64_t FirstDummyHandle = UINTPTR_MAX - 1024;
   uint64_t m_DummyHandle = FirstDummyHandle;
 };
diff --git a/renderdoc/driver/vulkan/vk_manager.h b/renderdoc/driver/vulkan/vk_manager.h
index 34bb52bb7..00b1e4537 100644
--- a/renderdoc/driver/vulkan/vk_manager.h
+++ b/renderdoc/driver/vulkan/vk_manager.h
@@ -512,7 +512,7 @@ private:
   rdcarray<ResourceId> InitialContentResources();
 
   // dummy handle to use - starting from near highest valid pointer to minimise risk of overlap with real handles
-  static const uint64_t FirstDummyHandle = INTPTR_MAX - 1024;
+  static const uint64_t FirstDummyHandle = UINTPTR_MAX - 1024;
   uint64_t m_DummyHandle = FirstDummyHandle;
 
   WrappedVulkan *m_Core;