diff --git a/act/container/docker_cli_test.go b/act/container/docker_cli_test.go
index f0b9657c..274d03ca 100644
--- a/act/container/docker_cli_test.go
+++ b/act/container/docker_cli_test.go
@@ -793,9 +793,9 @@ func TestParseEnvfileVariablesWithBOMUnicode(t *testing.T) {
 	}
 
 	// UTF16 with BOM
-	e := "contains invalid utf8 bytes at line"
+	e := "invalid utf8 bytes at line"
 	if _, _, _, err := parseRun([]string{"--env-file=testdata/utf16.env", "img", "cmd"}); err == nil || !strings.Contains(err.Error(), e) {
-		t.Fatalf("Expected an error with message '%s', got %v", e, err)
+		t.Fatalf("Expected an error with message '%s', got '%v'", e, err)
 	}
 	// UTF16BE with BOM
 	if _, _, _, err := parseRun([]string{"--env-file=testdata/utf16be.env", "img", "cmd"}); err == nil || !strings.Contains(err.Error(), e) {