diff --git a/pkgs/development/compilers/factor-lang/mk-factor-application.nix b/pkgs/development/compilers/factor-lang/mk-factor-application.nix
index 2b694d68ecdd..fd05e241e9e5 100644
--- a/pkgs/development/compilers/factor-lang/mk-factor-application.nix
+++ b/pkgs/development/compilers/factor-lang/mk-factor-application.nix
@@ -54,7 +54,7 @@ in
               first2 deploy-vocab
           ] [
               drop
-              "usage: deploy-me <PATH-TO-VOCAB> <TARGET-DIR>" print
+              "Usage: deploy-me <PATH-TO-VOCAB> <TARGET-DIR>" print
               nl
           ] if ;