diff --git a/dlls/d3d10/d3d10_main.c b/dlls/d3d10/d3d10_main.c
index 01fefbac6c3..6d4d62601c4 100644
--- a/dlls/d3d10/d3d10_main.c
+++ b/dlls/d3d10/d3d10_main.c
@@ -121,6 +121,11 @@ HRESULT WINAPI D3D10CreateDevice(IDXGIAdapter *adapter, D3D10_DRIVER_TYPE driver
                 }
                 break;
             }
+
+            default:
+                FIXME("Unhandled driver type %#x.\n", driver_type);
+                IDXGIFactory_Release(factory);
+                return E_FAIL;
         }
     }
 
diff --git a/dlls/d3d10/utils.c b/dlls/d3d10/utils.c
index 6bb7d051468..9ffff137da7 100644
--- a/dlls/d3d10/utils.c
+++ b/dlls/d3d10/utils.c
@@ -34,6 +34,7 @@ const char *debug_d3d10_driver_type(D3D10_DRIVER_TYPE driver_type)
         WINE_D3D10_TO_STR(D3D10_DRIVER_TYPE_REFERENCE);
         WINE_D3D10_TO_STR(D3D10_DRIVER_TYPE_NULL);
         WINE_D3D10_TO_STR(D3D10_DRIVER_TYPE_SOFTWARE);
+        WINE_D3D10_TO_STR(D3D10_DRIVER_TYPE_WARP);
         default:
             FIXME("Unrecognized D3D10_DRIVER_TYPE %#x\n", driver_type);
             return "unrecognized";
diff --git a/include/d3d10misc.h b/include/d3d10misc.h
index 9f7f8e97c8b..f8f5617fea2 100644
--- a/include/d3d10misc.h
+++ b/include/d3d10misc.h
@@ -30,6 +30,7 @@ typedef enum D3D10_DRIVER_TYPE {
     D3D10_DRIVER_TYPE_REFERENCE = 1,
     D3D10_DRIVER_TYPE_NULL      = 2,
     D3D10_DRIVER_TYPE_SOFTWARE  = 3,
+    D3D10_DRIVER_TYPE_WARP      = 5,
 } D3D10_DRIVER_TYPE;
 
 HRESULT WINAPI D3D10CreateDevice(IDXGIAdapter *adapter, D3D10_DRIVER_TYPE driver_type,