diff --git a/core/src/eval/operation.rs b/core/src/eval/operation.rs
index a007b2aff3..814803e865 100644
--- a/core/src/eval/operation.rs
+++ b/core/src/eval/operation.rs
@@ -1162,7 +1162,7 @@ impl<R: ImportResolver, C: Cache> VirtualMachine<R, C> {
                     // Not using mk_type_error! because of a non-uniform message
                     Err(EvalError::TypeError(
                         String::from("String"),
-                        String::from("%eval_nix% takes a string of nix code as an argument"),
+                        String::from("eval_nix takes a string of nix code as an argument"),
                         arg_pos,
                         RichTerm { term: t, pos },
                     ))