diff --git a/renderdoc/driver/vulkan/vk_overlay.cpp b/renderdoc/driver/vulkan/vk_overlay.cpp
index bd0f1beb5..6ad6f82ca 100644
--- a/renderdoc/driver/vulkan/vk_overlay.cpp
+++ b/renderdoc/driver/vulkan/vk_overlay.cpp
@@ -972,8 +972,14 @@ ResourceId VulkanReplay::RenderOverlay(ResourceId texid, CompType typeHint, Floa
 
       if(m_pDriver->m_ExtensionsEnabled[VkCheckExt_AMD_neg_viewport] ||
          m_pDriver->m_ExtensionsEnabled[VkCheckExt_KHR_maintenance1])
+      {
         ubo->RectSize.y = fabs(viewport.height);
 
+        // VK_KHR_maintenance1 requires the position to be adjusted as well
+        if(m_pDriver->m_ExtensionsEnabled[VkCheckExt_KHR_maintenance1] && viewport.height < 0.0f)
+          ubo->RectPosition.y += viewport.height;
+      }
+
       m_Overlay.m_CheckerUBO.Unmap();
 
       vt->CmdBindPipeline(Unwrap(cmd), VK_PIPELINE_BIND_POINT_GRAPHICS,