diff --git a/docker_helpers_test.go b/docker_helpers_test.go
index 9ac8cff..357278c 100644
--- a/docker_helpers_test.go
+++ b/docker_helpers_test.go
@@ -255,6 +255,9 @@ func doTest(t *testing.T, file string, config *Config) *testStore {
 	p := path.Join("fixtures", file)
 	f, err := os.Open(p)
 	assert.NoError(t, err)
+	if err != nil {
+		t.FailNow()
+	}
 
 	b, err := io.ReadAll(f)
 	assert.NoError(t, err)
diff --git a/docker_test.go b/docker_test.go
index 4ef76f8..f6806ce 100644
--- a/docker_test.go
+++ b/docker_test.go
@@ -135,7 +135,7 @@ func Test_helloWorldIgnore(t *testing.T) {
 }
 
 func Test_samePrefix(t *testing.T) {
-	store := doTest(t, "prefix.yml")
+	store := doTest(t, "prefix.yml", nil)
 
 	// Two services `hello` and `hello-test`.
 	// The former's name is a prefix of the latter. Ensure the matching does not mix them up.