diff --git a/cmd/infractl/cluster/utils/validate.go b/cmd/infractl/cluster/utils/validate.go
index 79838af1e..1f4f110d8 100644
--- a/cmd/infractl/cluster/utils/validate.go
+++ b/cmd/infractl/cluster/utils/validate.go
@@ -67,7 +67,7 @@ func ValidateParameterArgument(parts []string) error {
 	if value == "" {
 		return errors.New("value is empty")
 	}
-	match, err = regexp.MatchString(`^[a-zA-Z0-9:?/.-_]+$`, value)
+	match, err = regexp.MatchString(`^[a-zA-Z0-9:\/\?._-]+$`, value)
 	if err != nil {
 		return err
 	}
diff --git a/cmd/infractl/cluster/utils/validate_test.go b/cmd/infractl/cluster/utils/validate_test.go
new file mode 100644
index 000000000..c165f3e74
--- /dev/null
+++ b/cmd/infractl/cluster/utils/validate_test.go
@@ -0,0 +1,15 @@
+package utils
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestValidateParameterArgument(t *testing.T) {
+	err := ValidateParameterArgument([]string{"machine-type", "e2-medium"})
+	assert.NoError(t, err, "no error expected")
+
+	err = ValidateParameterArgument([]string{"container-type", "container_d"})
+	assert.NoError(t, err, "no error expected")
+}