diff --git a/vips/foreign.go b/vips/foreign.go
index a85edae5..cfcaedb6 100644
--- a/vips/foreign.go
+++ b/vips/foreign.go
@@ -254,7 +254,7 @@ func isJP2K(buf []byte) bool {
 
 func vipsLoadFromBuffer(buf []byte, params *ImportParams) (*C.VipsImage, ImageType, ImageType, error) {
 	src := buf
-	// Reference src here so it's not garbage collected during image initialization.
+	// Reference src here, so it's not garbage collected during image initialization.
 	defer runtime.KeepAlive(src)
 
 	var err error
diff --git a/vips/image_test.go b/vips/image_test.go
index 5672a3aa..da6d0d89 100644
--- a/vips/image_test.go
+++ b/vips/image_test.go
@@ -145,6 +145,7 @@ func TestImageRef_BMP__ImplicitConversionToPNG(t *testing.T) {
 	exported, metadata, err := img.ExportNative()
 	assert.NoError(t, err)
 	assert.Equal(t, ImageTypePNG, metadata.Format)
+	assert.Equal(t, ImageTypeBMP, img.OriginalFormat())
 	assert.NotNil(t, exported)
 }