diff --git a/src/run.rs b/src/run.rs
index e7507e0..9403afb 100644
--- a/src/run.rs
+++ b/src/run.rs
@@ -1,4 +1,4 @@
-use std::{borrow::Cow, collections::HashMap, fmt::Debug, rc::Rc};
+use std::{collections::HashMap, fmt::Debug, rc::Rc};
 
 use crate::{
 	ast::{Constant, Expression, Location},
@@ -41,11 +41,11 @@ impl Scope {
 		self.variables.get(name.as_ref()).cloned()
 	}
 
-	pub fn set(&mut self, name: Cow<str>, value: Value) {
+	pub fn set(&mut self, name: String, value: Value) {
 		if let Some(value) = value {
-			self.variables.insert(name.into(), value);
+			self.variables.insert(name, value);
 		} else {
-			self.variables.remove(name.as_ref());
+			self.variables.remove(&name);
 		}
 	}
 }