diff --git a/src/librustc/middle/trans/common.rs b/src/librustc/middle/trans/common.rs
index 71ddc2e40459c..7fe3db7534f94 100644
--- a/src/librustc/middle/trans/common.rs
+++ b/src/librustc/middle/trans/common.rs
@@ -106,7 +106,7 @@ pub fn return_type_is_void(ccx: &CrateContext, ty: ty::t) -> bool {
 /// Generates a unique symbol based off the name given. This is used to create
 /// unique symbols for things like closures.
 pub fn gensym_name(name: &str) -> PathElem {
-    let num = token::gensym(name);
+    let num = token::gensym(name).uint();
     // use one colon which will get translated to a period by the mangler, and
     // we're guaranteed that `num` is globally unique for this crate.
     PathName(token::gensym(format!("{}:{}", name, num).as_slice()))