diff --git a/testdata/gopher-doc.with-alpha.lossless.webp b/testdata/gopher-doc.with-alpha.lossless.webp
new file mode 100644
index 0000000..fe5018d
Binary files /dev/null and b/testdata/gopher-doc.with-alpha.lossless.webp differ
diff --git a/testdata/gopher-doc.with-alpha.png b/testdata/gopher-doc.with-alpha.png
new file mode 100644
index 0000000..ba3236b
Binary files /dev/null and b/testdata/gopher-doc.with-alpha.png differ
diff --git a/webp/decode.go b/webp/decode.go
index d6eefd5..5e3bfc4 100644
--- a/webp/decode.go
+++ b/webp/decode.go
@@ -102,9 +102,6 @@ func decode(r io.Reader, configOnly bool) (image.Image, image.Config, error) {
 			return m, image.Config{}, nil
 
 		case fccVP8L:
-			if wantAlpha || alpha != nil {
-				return nil, image.Config{}, errInvalidFormat
-			}
 			if configOnly {
 				c, err := vp8l.DecodeConfig(chunkData)
 				return nil, c, err
diff --git a/webp/decode_test.go b/webp/decode_test.go
index ad65b10..165e085 100644
--- a/webp/decode_test.go
+++ b/webp/decode_test.go
@@ -179,6 +179,7 @@ func TestDecodeVP8L(t *testing.T) {
 		"gopher-doc.8bpp",
 		"tux",
 		"yellow_rose",
+		"gopher-doc.with-alpha",
 	}
 
 loop: