diff --git a/cmd/core-lint/main.go b/cmd/core-lint/main.go
index 7057c91..de1c596 100644
--- a/cmd/core-lint/main.go
+++ b/cmd/core-lint/main.go
@@ -372,7 +372,9 @@ func newCatalogCommand() *cli.Command {
 		for _, rule := range rules {
 			fmt.Fprintf(command.OutOrStdout(), "%-14s [%-8s] %s\n", rule.ID, rule.Severity, rule.Title)
 		}
-		fmt.Fprintf(os.Stderr, "\n%d rule(s)\n", len(rules))
+		if _, err := fmt.Fprintf(os.Stderr, "\n%d rule(s)\n", len(rules)); err != nil {
+			return err
+		}
 		return nil
 	})
 	cli.StringFlag(listCmd, &listLanguage, "lang", "l", "", "Filter by language")