diff --git a/command.go b/command.go
index b8d24aca..46923084 100644
--- a/command.go
+++ b/command.go
@@ -115,7 +115,7 @@ type Command struct {
 	// PersistentPostRunE: PersistentPostRun but returns an error.
 	PersistentPostRunE func(cmd *Command, args []string) error
 	// OnCommandNotFound: custom CommandNotFound handler
-	OnCommandNotFound func (cmd *Command, args []string)
+	OnCommandNotFound func(cmd *Command, args []string)
 
 	// SilenceErrors is an option to quiet errors down stream.
 	SilenceErrors bool