diff --git a/dlls/windowscodecs/bitmap.c b/dlls/windowscodecs/bitmap.c
index 0a7ecf5920d..22a48768892 100644
--- a/dlls/windowscodecs/bitmap.c
+++ b/dlls/windowscodecs/bitmap.c
@@ -266,9 +266,16 @@ static ULONG WINAPI BitmapImpl_Release(IWICBitmap *iface)
 static HRESULT WINAPI BitmapImpl_GetSize(IWICBitmap *iface,
     UINT *puiWidth, UINT *puiHeight)
 {
-    FIXME("(%p,%p,%p)\n", iface, puiWidth, puiHeight);
+    BitmapImpl *This = impl_from_IWICBitmap(iface);
+    TRACE("(%p,%p,%p)\n", iface, puiWidth, puiHeight);
 
-    return E_NOTIMPL;
+    if (!puiWidth || !puiHeight)
+        return E_INVALIDARG;
+
+    *puiWidth = This->width;
+    *puiHeight = This->height;
+
+    return S_OK;
 }
 
 static HRESULT WINAPI BitmapImpl_GetPixelFormat(IWICBitmap *iface,
diff --git a/dlls/windowscodecs/tests/bitmap.c b/dlls/windowscodecs/tests/bitmap.c
index fc45375e724..a0926abb984 100644
--- a/dlls/windowscodecs/tests/bitmap.c
+++ b/dlls/windowscodecs/tests/bitmap.c
@@ -256,12 +256,12 @@ todo_wine {
     ok(hr == S_OK, "IWICBitmap_GetResolution failed hr=%x\n", hr);
     ok(dpix == 12.0, "got %f, expected 12.0\n", dpix);
     ok(dpiy == 34.0, "got %f, expected 34.0\n", dpiy);
+}
 
     hr = IWICBitmap_GetSize(bitmap, &width, &height);
     ok(hr == S_OK, "IWICBitmap_GetSize failed hr=%x\n", hr);
     ok(width == 3, "got %d, expected 3\n", width);
     ok(height == 3, "got %d, expected 3\n", height);
-}
 
     IWICBitmap_Release(bitmap);
 }