diff --git a/base/rng.jl b/base/rng.jl
index c923aa123a135..b48826afab452 100644
--- a/base/rng.jl
+++ b/base/rng.jl
@@ -11,12 +11,10 @@ export librandom_init, srand,
        randchi2, randchi2!,
        randbeta, randbeta!,
        randbool, randbool!,
-       Rng, Rng_MT
+       AbstractRNG, MersenneTwister
 
 abstract AbstractRNG
 
-type MersenneTwister <: AbstractRNG; end
-
 const RNG = MersenneTwister
 
 type MersenneTwister <: AbstractRNG