diff --git a/command/pr.go b/command/pr.go
index 49e1f3c9a..d6873b4d7 100644
--- a/command/pr.go
+++ b/command/pr.go
@@ -69,6 +69,7 @@ With '--web', open the pull request in a web browser instead.`,
 var prCloseCmd = &cobra.Command{
 	Use:   "close [{<number> | <url>}]",
 	Short: "Close a pull request",
+	Args:  cobra.ExactArgs(1),
 	RunE:  prClose,
 }