diff --git a/collector/os_release_test.go b/collector/os_release_test.go
index e37cc34c..46838f15 100644
--- a/collector/os_release_test.go
+++ b/collector/os_release_test.go
@@ -48,6 +48,8 @@ func TestParseOSRelease(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
+	defer osReleaseFile.Close()
+
 	got, err := parseOSRelease(osReleaseFile)
 	if err != nil {
 		t.Fatal(err)