diff --git a/src/d3d9/d3d9_device.cpp b/src/d3d9/d3d9_device.cpp
index e821e19d9..2ae8e0704 100644
--- a/src/d3d9/d3d9_device.cpp
+++ b/src/d3d9/d3d9_device.cpp
@@ -4328,6 +4328,10 @@ namespace dxvk {
     if (unlikely((Flags & (D3DLOCK_DISCARD | D3DLOCK_NOOVERWRITE)) == (D3DLOCK_DISCARD | D3DLOCK_NOOVERWRITE)))
       Flags &= ~D3DLOCK_DISCARD;
 
+    // Tests show that D3D9 drivers ignore DISCARD when the device is lost.
+    if (unlikely(m_deviceLostState != D3D9DeviceLostState::Ok))
+      Flags &= ~D3DLOCK_DISCARD;
+
     auto& desc = *(pResource->Desc());
 
     if (unlikely(!desc.IsLockable))
@@ -4808,6 +4812,10 @@ namespace dxvk {
     if (desc.Usage & D3DUSAGE_DYNAMIC)
       Flags &= ~D3DLOCK_DONOTWAIT;
 
+    // Tests show that D3D9 drivers ignore DISCARD when the device is lost.
+    if (unlikely(m_deviceLostState != D3D9DeviceLostState::Ok))
+      Flags &= ~D3DLOCK_DISCARD;
+
     // We only bounds check for MANAGED.
     // (TODO: Apparently this is meant to happen for DYNAMIC too but I am not sure
     //  how that works given it is meant to be a DIRECT access..?)