diff --git a/src/librustc/metadata/encoder.rs b/src/librustc/metadata/encoder.rs
index 2dccf77da8ed..2da251815bde 100644
--- a/src/librustc/metadata/encoder.rs
+++ b/src/librustc/metadata/encoder.rs
@@ -61,7 +61,7 @@ pub struct EncodeParams<'a> {
     tcx: ty::ctxt,
     reexports2: middle::resolve::ExportMap2,
     item_symbols: &'a RefCell<HashMap<ast::NodeId, ~str>>,
-    non_inlineable_statics: &'a HashSet<ast::NodeId>,
+    non_inlineable_statics: &'a RefCell<HashSet<ast::NodeId>>,
     link_meta: &'a LinkMeta,
     cstore: @mut cstore::CStore,
     encode_inlined_item: encode_inlined_item<'a>,
@@ -90,7 +90,7 @@ pub struct EncodeContext<'a> {
     stats: @mut Stats,
     reexports2: middle::resolve::ExportMap2,
     item_symbols: &'a RefCell<HashMap<ast::NodeId, ~str>>,
-    non_inlineable_statics: &'a HashSet<ast::NodeId>,
+    non_inlineable_statics: &'a RefCell<HashSet<ast::NodeId>>,
     link_meta: &'a LinkMeta,
     cstore: &'a cstore::CStore,
     encode_inlined_item: encode_inlined_item<'a>,
@@ -923,7 +923,14 @@ fn encode_info_for_item(ecx: &EncodeContext,
         encode_name(ecx, ebml_w, item.ident);
         let elt = ast_map::path_pretty_name(item.ident, item.id as u64);
         encode_path(ecx, ebml_w, path, elt);
-        if !ecx.non_inlineable_statics.contains(&item.id) {
+
+        let non_inlineable;
+        {
+            let non_inlineable_statics = ecx.non_inlineable_statics.borrow();
+            non_inlineable = non_inlineable_statics.get().contains(&item.id);
+        }
+
+        if !non_inlineable {
             (ecx.encode_inlined_item)(ecx, ebml_w, path, ii_item(item));
         }
         encode_visibility(ebml_w, vis);
diff --git a/src/librustc/middle/trans/base.rs b/src/librustc/middle/trans/base.rs
index e842c6595c31..7f40aa43d1ac 100644
--- a/src/librustc/middle/trans/base.rs
+++ b/src/librustc/middle/trans/base.rs
@@ -2545,7 +2545,10 @@ pub fn get_item_val(ccx: @mut CrateContext, id: ast::NodeId) -> ValueRef {
 
                                 if !inlineable {
                                     debug!("{} not inlined", sym);
-                                    ccx.non_inlineable_statics.insert(id);
+                                    let mut non_inlineable_statics =
+                                        ccx.non_inlineable_statics
+                                           .borrow_mut();
+                                    non_inlineable_statics.get().insert(id);
                                 }
 
                                 let mut item_symbols = ccx.item_symbols
diff --git a/src/librustc/middle/trans/consts.rs b/src/librustc/middle/trans/consts.rs
index d6bbcec0daa5..51b373eb0cc7 100644
--- a/src/librustc/middle/trans/consts.rs
+++ b/src/librustc/middle/trans/consts.rs
@@ -176,8 +176,9 @@ pub fn get_const_val(cx: @mut CrateContext,
     }
 
     let const_values = cx.const_values.borrow();
+    let non_inlineable_statics = cx.non_inlineable_statics.borrow();
     (const_values.get().get_copy(&def_id.node),
-     !cx.non_inlineable_statics.contains(&def_id.node))
+     !non_inlineable_statics.get().contains(&def_id.node))
 }
 
 pub fn const_expr(cx: @mut CrateContext, e: &ast::Expr) -> (ValueRef, bool) {
diff --git a/src/librustc/middle/trans/context.rs b/src/librustc/middle/trans/context.rs
index 714f418117f6..b70dccb1f813 100644
--- a/src/librustc/middle/trans/context.rs
+++ b/src/librustc/middle/trans/context.rs
@@ -64,7 +64,7 @@ pub struct CrateContext {
      // A set of static items which cannot be inlined into other crates. This
      // will pevent in ii_item() structures from being encoded into the metadata
      // that is generated
-     non_inlineable_statics: HashSet<ast::NodeId>,
+     non_inlineable_statics: RefCell<HashSet<ast::NodeId>>,
      // Cache instances of monomorphized functions
      monomorphized: RefCell<HashMap<mono_id, ValueRef>>,
      monomorphizing: RefCell<HashMap<ast::DefId, uint>>,
@@ -192,7 +192,7 @@ impl CrateContext {
                   finished_tydescs: false,
                   external: HashMap::new(),
                   external_srcs: HashMap::new(),
-                  non_inlineable_statics: HashSet::new(),
+                  non_inlineable_statics: RefCell::new(HashSet::new()),
                   monomorphized: RefCell::new(HashMap::new()),
                   monomorphizing: RefCell::new(HashMap::new()),
                   vtables: RefCell::new(HashMap::new()),