diff --git a/renderdoc/driver/shaders/spirv/spirv_debug.cpp b/renderdoc/driver/shaders/spirv/spirv_debug.cpp
index 86a7d1416a..c81934fdd2 100644
--- a/renderdoc/driver/shaders/spirv/spirv_debug.cpp
+++ b/renderdoc/driver/shaders/spirv/spirv_debug.cpp
@@ -2715,12 +2715,12 @@ void ThreadState::StepNext(ShaderDebugState *state, const rdcarray<ThreadState>
       if(texType & DebugAPIWrapper::Subpass_Texture)
       {
         // get current position
-        ShaderVariable curCoord;
+        ShaderVariable curCoord(rdcstr(), 0.0f, 0.0f, 0.0f, 0.0f);
         debugger.GetAPIWrapper()->FillInputValue(curCoord, ShaderBuiltin::Position, 0, 0);
 
         // co-ords are relative to the current position
-        setUintComp(coord, 0, uintComp(coord, 0) + uintComp(curCoord, 0));
-        setUintComp(coord, 1, uintComp(coord, 1) + uintComp(curCoord, 1));
+        setUintComp(coord, 0, uintComp(coord, 0) + (uint32_t)floatComp(curCoord, 0));
+        setUintComp(coord, 1, uintComp(coord, 1) + (uint32_t)floatComp(curCoord, 1));
 
         // do it with samplegather as ImageFetch rather than a Read which caches the whole texture
         // on the CPU for no reason (since we can't write to it)
diff --git a/renderdoc/driver/vulkan/vk_shaderdebug.cpp b/renderdoc/driver/vulkan/vk_shaderdebug.cpp
index 0464df960f..37985bd4ff 100644
--- a/renderdoc/driver/vulkan/vk_shaderdebug.cpp
+++ b/renderdoc/driver/vulkan/vk_shaderdebug.cpp
@@ -3964,7 +3964,8 @@ ShaderDebugTrace *VulkanReplay::DebugPixel(uint32_t eventId, uint32_t x, uint32_
   std::map<ShaderBuiltin, ShaderVariable> &builtins = apiWrapper->builtin_inputs;
   builtins[ShaderBuiltin::DeviceIndex] = ShaderVariable(rdcstr(), 0U, 0U, 0U, 0U);
   builtins[ShaderBuiltin::DrawIndex] = ShaderVariable(rdcstr(), draw->drawIndex, 0U, 0U, 0U);
-  builtins[ShaderBuiltin::Position] = ShaderVariable(rdcstr(), x, y, 0U, 0U);
+  builtins[ShaderBuiltin::Position] =
+      ShaderVariable(rdcstr(), float(x) + 0.5f, float(y) + 0.5f, 0.0f, 0.0f);
 
   // If the pipe contains a geometry shader, then Primitive ID cannot be used in the pixel
   // shader without being emitted from the geometry shader. For now, check if this semantic