diff --git a/src/comp/middle/trans.rs b/src/comp/middle/trans.rs
index 0793d390d57d..b5171fdb9d12 100644
--- a/src/comp/middle/trans.rs
+++ b/src/comp/middle/trans.rs
@@ -5854,7 +5854,7 @@ fn zero_alloca(cx: &@block_ctxt, llptr: ValueRef, t: ty::t) -> result {
         bcx = call_bzero(llalign.bcx, llptr, llsz.val, llalign.val).bcx;
     } else {
         let llty = type_of(bcx_ccx(bcx), cx.sp, t);
-        bcx.build.Store(C_null(llty), llptr);
+        bcx = call_bzero(cx, llptr, llsize_of(llty), C_uint(1u)).bcx;
     }
     ret rslt(bcx, llptr);
 }