diff --git a/imageio/imageio-webp/src/test/java/com/twelvemonkeys/imageio/plugins/webp/WebPImageReaderTest.java b/imageio/imageio-webp/src/test/java/com/twelvemonkeys/imageio/plugins/webp/WebPImageReaderTest.java
index 5a325aee..e9dc7e67 100644
--- a/imageio/imageio-webp/src/test/java/com/twelvemonkeys/imageio/plugins/webp/WebPImageReaderTest.java
+++ b/imageio/imageio-webp/src/test/java/com/twelvemonkeys/imageio/plugins/webp/WebPImageReaderTest.java
@@ -58,7 +58,9 @@ public class WebPImageReaderTest extends ImageReaderAbstractTest<WebPImageReader
                         new Dimension(400, 400), new Dimension(400, 400), new Dimension(400, 394),
                         new Dimension(371, 394), new Dimension(394, 382), new Dimension(400, 388),
                         new Dimension(394, 383), new Dimension(394, 394), new Dimension(372, 394),
-                        new Dimension(400, 400), new Dimension(320, 382))
+                        new Dimension(400, 400), new Dimension(320, 382)),
+                // Alpha transparency and Alpha filtering
+                new TestData(getClassLoaderResource("/webp/alpha_filter.webp"), new Dimension(2000, 1447))
         );
     }