diff --git a/internal/command/command.go b/internal/command/command.go
index ebda1020d..70f25501a 100644
--- a/internal/command/command.go
+++ b/internal/command/command.go
@@ -40,7 +40,7 @@ func New() (*Command, error) {
 
 	var cfg icingadbconfig.Config
 	if err := config.FromYAMLFile(flags.Config, &cfg); err != nil {
-		if errors.Is(err, config.InvalidArgumentError) {
+		if errors.Is(err, config.ErrInvalidArgument) {
 			return nil, err
 		}
 
diff --git a/pkg/config/config.go b/pkg/config/config.go
index f656be83f..73d62985f 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -10,18 +10,18 @@ import (
 	"reflect"
 )
 
-// InvalidArgumentError is the error returned by [ParseFlags] or [FromYAMLFile] if
+// ErrInvalidArgument is the error returned by [ParseFlags] or [FromYAMLFile] if
 // its parsing result cannot be stored in the value pointed to by the designated passed argument which
 // must be a non-nil pointer.
-var InvalidArgumentError = stderrors.New("invalid argument")
+var ErrInvalidArgument = stderrors.New("invalid argument")
 
 // FromYAMLFile parses the given YAML file and stores the result
 // in the value pointed to by v. If v is nil or not a pointer,
-// FromYAMLFile returns an [InvalidArgumentError].
+// FromYAMLFile returns an [ErrInvalidArgument].
 func FromYAMLFile(name string, v Validator) error {
 	rv := reflect.ValueOf(v)
 	if rv.Kind() != reflect.Pointer || rv.IsNil() {
-		return errors.Wrapf(InvalidArgumentError, "non-nil pointer expected, got %T", v)
+		return errors.Wrapf(ErrInvalidArgument, "non-nil pointer expected, got %T", v)
 	}
 
 	f, err := os.Open(name)
@@ -50,11 +50,11 @@ func FromYAMLFile(name string, v Validator) error {
 
 // ParseFlags parses CLI flags and stores the result
 // in the value pointed to by v. If v is nil or not a pointer,
-// ParseFlags returns an [InvalidArgumentError].
+// ParseFlags returns an [ErrInvalidArgument].
 func ParseFlags(v any) error {
 	rv := reflect.ValueOf(v)
 	if rv.Kind() != reflect.Pointer || rv.IsNil() {
-		return errors.Wrapf(InvalidArgumentError, "non-nil pointer expected, got %T", v)
+		return errors.Wrapf(ErrInvalidArgument, "non-nil pointer expected, got %T", v)
 	}
 
 	parser := flags.NewParser(v, flags.Default)
diff --git a/pkg/types/unix_milli.go b/pkg/types/unix_milli.go
index 7391ec020..bfbb694a4 100644
--- a/pkg/types/unix_milli.go
+++ b/pkg/types/unix_milli.go
@@ -26,7 +26,7 @@ func (t UnixMilli) MarshalJSON() ([]byte, error) {
 		return []byte("null"), nil
 	}
 
-	return []byte(strconv.FormatInt(time.Time(t).UnixMilli(), 10)), nil
+	return []byte(strconv.FormatInt(t.Time().UnixMilli(), 10)), nil
 }
 
 // UnmarshalJSON implements the json.Unmarshaler interface.
@@ -45,7 +45,7 @@ func (t UnixMilli) MarshalText() ([]byte, error) {
 		return []byte{}, nil
 	}
 
-	return []byte(strconv.FormatInt(time.Time(t).UnixMilli(), 10)), nil
+	return []byte(strconv.FormatInt(t.Time().UnixMilli(), 10)), nil
 }
 
 // UnmarshalText implements the encoding.TextUnmarshaler interface.