diff --git a/pkg/cli/deprecation.go b/pkg/cli/deprecation.go
index 379d986a7..98fc1d1c1 100644
--- a/pkg/cli/deprecation.go
+++ b/pkg/cli/deprecation.go
@@ -24,16 +24,19 @@ func (d DeprecationLoader) Load(args []string, cmd *cli.Command) (bool, error) {
 }
 
 // logDeprecation prints deprecation hints and returns whether incompatible deprecated options need to be removed.
-func logDeprecation(traefikConfiguration interface{}, args []string) bool {
+func logDeprecation(traefikConfiguration interface{}, arguments []string) bool {
 	// This part doesn't handle properly a flag defined like this:
 	// --accesslog true
 	// where `true` could be considered as a new argument.
-	// This is not really an issue with the deprecation loader since it will filter the unknown nodes later in this
-	// function.
-	for i, arg := range args {
+	// This is not really an issue with the deprecation loader since it will filter the unknown nodes later in this function.
+	var args []string
+	for _, arg := range arguments {
 		if !strings.Contains(arg, "=") {
-			args[i] = arg + "=true"
+			args = append(args, arg+"=true")
+			continue
 		}
+
+		args = append(args, arg)
 	}
 
 	labels, err := flag.Parse(args, nil)