diff --git a/dlls/dwrite/gdiinterop.c b/dlls/dwrite/gdiinterop.c
index c3bcc889965..bac6e40e0fb 100644
--- a/dlls/dwrite/gdiinterop.c
+++ b/dlls/dwrite/gdiinterop.c
@@ -36,6 +36,7 @@ struct rendertarget {
     IDWriteBitmapRenderTarget IDWriteBitmapRenderTarget_iface;
     LONG ref;
 
+    SIZE size;
     HDC hdc;
 };
 
@@ -135,8 +136,10 @@ static HRESULT WINAPI rendertarget_SetCurrentTransform(IDWriteBitmapRenderTarget
 static HRESULT WINAPI rendertarget_GetSize(IDWriteBitmapRenderTarget *iface, SIZE *size)
 {
     struct rendertarget *This = impl_from_IDWriteBitmapRenderTarget(iface);
-    FIXME("(%p)->(%p): stub\n", This, size);
-    return E_NOTIMPL;
+
+    TRACE("(%p)->(%p)\n", This, size);
+    *size = This->size;
+    return S_OK;
 }
 
 static HRESULT WINAPI rendertarget_Resize(IDWriteBitmapRenderTarget *iface, UINT32 width, UINT32 height)
@@ -175,6 +178,9 @@ static HRESULT create_rendertarget(HDC hdc, UINT32 width, UINT32 height, IDWrite
     This->IDWriteBitmapRenderTarget_iface.lpVtbl = &rendertargetvtbl;
     This->ref = 1;
 
+    This->size.cx = width;
+    This->size.cy = height;
+
     This->hdc = CreateCompatibleDC(hdc);
 
     memset(bmi, 0, sizeof(bmibuf));
diff --git a/dlls/dwrite/tests/font.c b/dlls/dwrite/tests/font.c
index 97cd4775cc2..ccaba88026a 100644
--- a/dlls/dwrite/tests/font.c
+++ b/dlls/dwrite/tests/font.c
@@ -158,6 +158,7 @@ static void test_CreateBitmapRenderTarget(void)
     DIBSECTION ds;
     HBITMAP hbm;
     HRESULT hr;
+    SIZE size;
     HDC hdc;
     int ret;
 
@@ -168,6 +169,15 @@ static void test_CreateBitmapRenderTarget(void)
     hr = IDWriteGdiInterop_CreateBitmapRenderTarget(interop, NULL, 0, 0, &target);
     EXPECT_HR(hr, S_OK);
 
+if (0) /* crashes on native */
+    hr = IDWriteBitmapRenderTarget_GetSize(target, NULL);
+
+    size.cx = size.cy = -1;
+    hr = IDWriteBitmapRenderTarget_GetSize(target, &size);
+    EXPECT_HR(hr, S_OK);
+    ok(size.cx == 0, "got %d\n", size.cx);
+    ok(size.cy == 0, "got %d\n", size.cy);
+
     target2 = NULL;
     hr = IDWriteGdiInterop_CreateBitmapRenderTarget(interop, NULL, 0, 0, &target2);
     EXPECT_HR(hr, S_OK);
@@ -213,6 +223,12 @@ static void test_CreateBitmapRenderTarget(void)
     ok(ds.dsBm.bmBitsPixel == 32, "got %d\n", ds.dsBm.bmBitsPixel);
     ok(ds.dsBm.bmBits != NULL, "got %p\n", ds.dsBm.bmBits);
 
+    size.cx = size.cy = -1;
+    hr = IDWriteBitmapRenderTarget_GetSize(target, &size);
+    EXPECT_HR(hr, S_OK);
+    ok(size.cx == 10, "got %d\n", size.cx);
+    ok(size.cy == 5, "got %d\n", size.cy);
+
     IDWriteBitmapRenderTarget_Release(target);
 
     IDWriteGdiInterop_Release(interop);