diff --git a/unarchive/archive.go b/unarchive/archive.go
index ada7a95..85e585f 100644
--- a/unarchive/archive.go
+++ b/unarchive/archive.go
@@ -24,7 +24,7 @@ var supportedArchives = []archiver.ExtensionChecker{
 	&archiver.Xz{}, &archiver.Zstd{},
 }
 
-func (u *Unarchiver) IsSupportedArchive(filePath string) bool {
+func IsSupportedArchive(filePath string) bool {
 	archive, err := archiver.ByExtension(filePath)
 	if err != nil {
 		return false
diff --git a/unarchive/archive_test.go b/unarchive/archive_test.go
index 4d17eb9..014e593 100644
--- a/unarchive/archive_test.go
+++ b/unarchive/archive_test.go
@@ -132,6 +132,6 @@ func TestUnarchiveDotDir(t *testing.T) {
 
 func runUnarchive(t *testing.T, uarchiver Unarchiver, archiveFileName, sourceDir, targetDir string) error {
 	archivePath := filepath.Join("testdata", sourceDir, archiveFileName)
-	assert.True(t, uarchiver.IsSupportedArchive(archivePath))
+	assert.True(t, IsSupportedArchive(archivePath))
 	return uarchiver.Unarchive(filepath.Join("testdata", sourceDir, archiveFileName), archiveFileName, targetDir)
 }