diff --git a/Interpreters_template.v b/Interpreters_template.v
index 5ed4380..d289bf9 100644
--- a/Interpreters_template.v
+++ b/Interpreters_template.v
@@ -249,6 +249,7 @@ Example factorial_ugly :=
  * them from our examples. *)
 Coercion Const : nat >-> arith.
 Coercion Var : var >-> arith.
+Declare Scope arith_scope.
 Infix "+" := Plus : arith_scope.
 Infix "-" := Minus : arith_scope.
 Infix "*" := Times : arith_scope.