diff --git a/options.go b/options.go
index 248fbe3..3d46fb2 100644
--- a/options.go
+++ b/options.go
@@ -226,7 +226,7 @@ type Options struct {
 	OutputICC      string
 	InputICC       string
 	Palette        bool
-	// Speed defines the AVIF encoders CPU effort.
+	// Speed defines the AVIF encoders CPU effort. Valid values are 0-8.
 	Speed          int
 
 	// private fields
diff --git a/testdata/test.avif b/testdata/test.avif
new file mode 100644
index 0000000..d37c273
Binary files /dev/null and b/testdata/test.avif differ
diff --git a/vips_test.go b/vips_test.go
index 00c1987..97e0284 100644
--- a/vips_test.go
+++ b/vips_test.go
@@ -33,7 +33,7 @@ func TestVipsSave(t *testing.T) {
 
 	for _, typ := range types {
 		image, _, _ := vipsRead(readImage("test.jpg"))
-		options := vipsSaveOptions{Quality: 95, Type: typ, StripMetadata: true, Speed: 8}
+		options := vipsSaveOptions{Quality: 95, Type: typ, StripMetadata: true}
 
 		buf, err := vipsSave(image, options)
 		if err != nil {
@@ -58,12 +58,12 @@ func TestVipsSaveTiff(t *testing.T) {
 	}
 }
 
-func TestVipsSafeAvif(t *testing.T) {
+func TestVipsSaveAvif(t *testing.T) {
 	if !IsTypeSupportedSave(AVIF) {
 		t.Skipf("Format %#v is not supported", ImageTypes[AVIF])
 	}
 	image, _, _ := vipsRead(readImage("test.jpg"))
-	options := vipsSaveOptions{Quality: 95, Type: AVIF}
+	options := vipsSaveOptions{Quality: 95, Type: AVIF, Speed: 8}
 	buf, err := vipsSave(image, options)
 	if err != nil {
 		t.Fatalf("Error saving image type %v: %v", ImageTypes[AVIF], err)