diff --git a/src/render/direct3d/SDL_render_d3d.c b/src/render/direct3d/SDL_render_d3d.c
index 67cddb387..285ddb761 100644
--- a/src/render/direct3d/SDL_render_d3d.c
+++ b/src/render/direct3d/SDL_render_d3d.c
@@ -1216,6 +1216,7 @@ D3D_RenderClear(SDL_Renderer * renderer)
     D3D_RenderData *data = (D3D_RenderData *) renderer->driverdata;
     DWORD color;
     HRESULT result;
+    int BackBufferWidth, BackBufferHeight;
 
     if (D3D_ActivateRenderer(renderer) < 0) {
         return -1;
@@ -1223,10 +1224,18 @@ D3D_RenderClear(SDL_Renderer * renderer)
 
     color = D3DCOLOR_ARGB(renderer->a, renderer->r, renderer->g, renderer->b);
 
+    if (renderer->target) {
+        BackBufferWidth = renderer->target->w;
+        BackBufferHeight = renderer->target->h;
+    } else {
+        BackBufferWidth = data->pparams.BackBufferWidth;
+        BackBufferHeight = data->pparams.BackBufferHeight;
+    }
+
     /* Don't reset the viewport if we don't have to! */
     if (!renderer->viewport.x && !renderer->viewport.y &&
-        renderer->viewport.w == data->pparams.BackBufferWidth &&
-        renderer->viewport.h == data->pparams.BackBufferHeight) {
+        renderer->viewport.w == BackBufferWidth &&
+        renderer->viewport.h == BackBufferHeight) {
         result = IDirect3DDevice9_Clear(data->device, 0, NULL, D3DCLEAR_TARGET, color, 0.0f, 0);
     } else {
         D3DVIEWPORT9 viewport;
@@ -1234,8 +1243,8 @@ D3D_RenderClear(SDL_Renderer * renderer)
         /* Clear is defined to clear the entire render target */
         viewport.X = 0;
         viewport.Y = 0;
-        viewport.Width = data->pparams.BackBufferWidth;
-        viewport.Height = data->pparams.BackBufferHeight;
+        viewport.Width = BackBufferWidth;
+        viewport.Height = BackBufferHeight;
         viewport.MinZ = 0.0f;
         viewport.MaxZ = 1.0f;
         IDirect3DDevice9_SetViewport(data->device, &viewport);