diff --git a/src/librustc/middle/trans/base.rs b/src/librustc/middle/trans/base.rs
index 77eea3ef3642..e4bcfd3d1a75 100644
--- a/src/librustc/middle/trans/base.rs
+++ b/src/librustc/middle/trans/base.rs
@@ -163,9 +163,12 @@ impl<'a> Drop for StatRecorder<'a> {
             let end = time::precise_time_ns();
             let elapsed = ((end - self.start) / 1_000_000) as uint;
             let iend = self.ccx.stats.n_llvm_insns.get();
-            self.ccx.stats.fn_stats.push((self.name.to_owned(),
-                                          elapsed,
-                                          iend - self.istart));
+            {
+                let mut fn_stats = self.ccx.stats.fn_stats.borrow_mut();
+                fn_stats.get().push((self.name.to_owned(),
+                                     elapsed,
+                                     iend - self.istart));
+            }
             self.ccx.stats.n_fns.set(self.ccx.stats.n_fns.get() + 1);
             // Reset LLVM insn count to avoid compound costs.
             self.ccx.stats.n_llvm_insns.set(self.istart);
@@ -3256,13 +3259,16 @@ pub fn trans_crate(sess: session::Session,
         println!("n_inlines: {}", ccx.stats.n_inlines.get());
         println!("n_closures: {}", ccx.stats.n_closures.get());
         println("fn stats:");
-
-        ccx.stats.fn_stats.sort_by(|&(_, _, insns_a), &(_, _, insns_b)| insns_b.cmp(&insns_a));
-
-        for tuple in ccx.stats.fn_stats.iter() {
-            match *tuple {
-                (ref name, ms, insns) => {
-                    println!("{} insns, {} ms, {}", insns, ms, *name);
+        {
+            let mut fn_stats = ccx.stats.fn_stats.borrow_mut();
+            fn_stats.get().sort_by(|&(_, _, insns_a), &(_, _, insns_b)| {
+                insns_b.cmp(&insns_a)
+            });
+            for tuple in fn_stats.get().iter() {
+                match *tuple {
+                    (ref name, ms, insns) => {
+                        println!("{} insns, {} ms, {}", insns, ms, *name);
+                    }
                 }
             }
         }
diff --git a/src/librustc/middle/trans/common.rs b/src/librustc/middle/trans/common.rs
index edde0e6e7083..a9c5f223b944 100644
--- a/src/librustc/middle/trans/common.rs
+++ b/src/librustc/middle/trans/common.rs
@@ -136,7 +136,8 @@ pub struct Stats {
     n_closures: Cell<uint>,
     n_llvm_insns: Cell<uint>,
     llvm_insns: RefCell<HashMap<~str, uint>>,
-    fn_stats: ~[(~str, uint, uint)] // (ident, time-in-ms, llvm-instructions)
+    // (ident, time-in-ms, llvm-instructions)
+    fn_stats: RefCell<~[(~str, uint, uint)]>,
 }
 
 pub struct BuilderRef_res {
diff --git a/src/librustc/middle/trans/context.rs b/src/librustc/middle/trans/context.rs
index 410f0e27b327..78d3dc8a2b16 100644
--- a/src/librustc/middle/trans/context.rs
+++ b/src/librustc/middle/trans/context.rs
@@ -221,7 +221,7 @@ impl CrateContext {
                     n_closures: Cell::new(0u),
                     n_llvm_insns: Cell::new(0u),
                     llvm_insns: RefCell::new(HashMap::new()),
-                    fn_stats: ~[]
+                    fn_stats: RefCell::new(~[]),
                   },
                   tydesc_type: tydesc_type,
                   int_type: int_type,