1 files changed, 10 insertions, 9 deletions
diff --git a/src/makefile/target.rs b/src/makefile/target.rs
index 5de280d..8f56506 100644
--- a/src/makefile/target.rs
+++ b/src/makefile/target.rs
@@ -148,31 +148,32 @@ impl Into<HashMap<String, Target>> for StaticTargetSet {
 // for targets that might become updated and so need refcelling
 #[derive(Clone, Default)]
 pub struct DynamicTargetSet {
-    data: HashMap<String, Rc<RefCell<Target>>>,
+    data: RefCell<HashMap<String, Rc<RefCell<Target>>>>,
 }
 
 impl DynamicTargetSet {
     pub fn get(&self, name: &str) -> Option<Rc<RefCell<Target>>> {
-        self.data.get(name).map(|x| Rc::clone(x))
+        self.data.borrow().get(name).map(|x| Rc::clone(x))
     }
 
-    pub fn put(&mut self, target: Target) {
-        if let Some(existing_target) = self.data.get_mut(&target.name) {
+    pub fn put(&self, target: Target) {
+        if let Some(existing_target) = self.data.borrow().get(&target.name) {
             existing_target.borrow_mut().extend(target);
-        } else {
-            self.data
-                .insert(target.name.clone(), Rc::new(RefCell::new(target)));
+            return;
         }
+        self.data
+            .borrow_mut()
+            .insert(target.name.clone(), Rc::new(RefCell::new(target)));
     }
 
     pub fn has(&self, name: &str) -> bool {
-        self.data.contains_key(name)
+        self.data.borrow().contains_key(name)
     }
 }
 
 impl fmt::Display for DynamicTargetSet {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        for target in self.data.values() {
+        for target in self.data.borrow().values() {
             writeln!(f, "{}", target.borrow())?;
         }
         Ok(())