diff --git a/internal/cmd/flag.go b/internal/cmd/flag.go
index bf046b24..10cc1321 100644
--- a/internal/cmd/flag.go
+++ b/internal/cmd/flag.go
@@ -17,22 +17,15 @@ var _ flag.Value = (*uint32Value)(nil)
 
 // Set implements the [flag.Value] interface for *uint32Value.
 func (i *uint32Value) Set(s string) (err error) {
-	v, err := strconv.ParseInt(s, 0, 32)
-	if err != nil {
-		// Don't wrap the error, because it's informative enough as is.
-		return err
-	} else if v < 0 {
-		return fmt.Errorf("negative value: %v", v)
-	}
-
+	v, err := strconv.ParseUint(s, 0, 32)
 	*i = uint32Value(v)
 
-	return nil
+	return err
 }
 
 // String implements the [flag.Value] interface for *uint32Value.
 func (i *uint32Value) String() (out string) {
-	return strconv.Itoa(int(*i))
+	return strconv.FormatUint(uint64(*i), 10)
 }
 
 // float32Value is an float32 that can be defined as a flag for [flag.FlagSet].
@@ -95,6 +88,10 @@ func (i *intSliceValue) Set(s string) (err error) {
 
 // String implements the [flag.Value] interface for *intSliceValue.
 func (i *intSliceValue) String() (out string) {
+	if i == nil || i.values == nil {
+		return ""
+	}
+
 	sb := &strings.Builder{}
 	for idx, v := range *i.values {
 		if idx > 0 {
@@ -144,6 +141,10 @@ func (i *stringSliceValue) Set(s string) (err error) {
 
 // String implements the [flag.Value] interface for *stringSliceValue.
 func (i *stringSliceValue) String() (out string) {
+	if i == nil || i.values == nil {
+		return ""
+	}
+
 	sb := &strings.Builder{}
 	for idx, v := range *i.values {
 		if idx > 0 {