diff --git a/cobra_test.go b/cobra_test.go
index 6c443e7..b78a656 100644
--- a/cobra_test.go
+++ b/cobra_test.go
@@ -675,7 +675,7 @@ func TestPersistentFlags(t *testing.T) {
 	fullSetupTest("echo times -s again -c -p test here")
 
 	if strings.Join(tt, " ") != "test here" {
-		t.Errorf("flags didn't leave proper args remaining..%s given", tt)
+		t.Errorf("flags didn't leave proper args remaining. %s given", tt)
 	}
 
 	if flags1 != "again" {
diff --git a/command.go b/command.go
index a436656..52231c3 100644
--- a/command.go
+++ b/command.go
@@ -772,6 +772,7 @@ func (c *Command) initHelpCmd() {
 func (c *Command) ResetCommands() {
 	c.commands = nil
 	c.helpCommand = nil
+	c.parentsPflags = nil
 }
 
 // Sorts commands by their names.
@@ -1083,7 +1084,6 @@ func (c *Command) LocalNonPersistentFlags() *flag.FlagSet {
 // LocalFlags returns the local FlagSet specifically set in the current command.
 func (c *Command) LocalFlags() *flag.FlagSet {
 	c.mergePersistentFlags()
-	c.updateParentsPersistentFlags()
 
 	if c.lflags == nil {
 		c.lflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
@@ -1106,7 +1106,6 @@ func (c *Command) LocalFlags() *flag.FlagSet {
 // InheritedFlags returns all flags which were inherited from parents commands.
 func (c *Command) InheritedFlags() *flag.FlagSet {
 	c.mergePersistentFlags()
-	c.updateParentsPersistentFlags()
 
 	if c.iflags == nil {
 		c.iflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
@@ -1226,10 +1225,37 @@ func (c *Command) Parent() *Command {
 	return c.parent
 }
 
-func (c *Command) updateParentsPersistentFlags() {
+// mergePersistentFlags merges c.PersistentFlags() to c.Flags()
+// and adds missing persistent flags of all parents.
+func (c *Command) mergePersistentFlags() {
+	if c.HasPersistentFlags() {
+		c.PersistentFlags().VisitAll(func(f *flag.Flag) {
+			if c.Flags().Lookup(f.Name) == nil {
+				c.Flags().AddFlag(f)
+			}
+		})
+	}
+
+	added := c.updateParentsPflags()
+	if len(added) > 0 {
+		for _, f := range added {
+			if c.Flags().Lookup(f.Name) == nil {
+				c.Flags().AddFlag(f)
+			}
+		}
+	}
+}
+
+// updateParentsPflags updates c.parentsPflags by adding
+// new persistent flags of all parents and returns added flags.
+// If c.parentsPflags == nil, it makes new.
+//
+// This function must be used ONLY in mergePersistentFlags.
+func (c *Command) updateParentsPflags() (added []*flag.Flag) {
 	if c.parentsPflags == nil {
 		c.parentsPflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
 		c.parentsPflags.SetOutput(c.OutOrStderr())
+		c.parentsPflags.SortFlags = false
 	}
 
 	c.VisitParents(func(x *Command) {
@@ -1237,24 +1263,11 @@ func (c *Command) updateParentsPersistentFlags() {
 			x.PersistentFlags().VisitAll(func(f *flag.Flag) {
 				if c.parentsPflags.Lookup(f.Name) == nil {
 					c.parentsPflags.AddFlag(f)
+					added = append(added, f)
 				}
 			})
 		}
 	})
-}
 
-func (c *Command) mergePersistentFlags() {
-	flags := c.Flags()
-
-	merge := func(x *Command) {
-		if x.HasPersistentFlags() {
-			x.PersistentFlags().VisitAll(func(f *flag.Flag) {
-				if flags.Lookup(f.Name) == nil {
-					flags.AddFlag(f)
-				}
-			})
-		}
-	}
-	merge(c)
-	c.VisitParents(merge)
+	return added
 }