diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 7271776eb..e2f2308aa 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -1381,10 +1381,10 @@ void EvalState::autoCallFunction(Bindings & args, Value & fun, Value & res)
             } else if (!i.def) {
                 throwMissingArgumentError(i.pos, R"(cannot evaluate a function that has an argument without a value ('%1%')
 
-nix attempted to evaluate a function as a top level expression; in this case it must have its
-arguments supplied either by default values, or passed explicitly with --arg or --argstr.
-
-https://nixos.org/manual/nix/stable/#ss-functions)", i.name);
+Nix attempted to evaluate a function as a top level expression; in
+this case it must have its arguments supplied either by default
+values, or passed explicitly with '--arg' or '--argstr'. See
+https://nixos.org/manual/nix/stable/#ss-functions.)", i.name);
 
             }
         }