diff --git a/docs/src/gpu.md b/docs/src/gpu.md
index 1ef7a827..63891e1d 100644
--- a/docs/src/gpu.md
+++ b/docs/src/gpu.md
@@ -32,4 +32,4 @@ m = mapleaves(cu, m)
 d(cu(rand(10)))
 ```
 
-The [mnist example](https://github.com/FluxML/model-zoo/blob/master/mnist/mnist.jl) contains the code needed to run the model on the GPU; just uncomment the lines after `using CuArrays`.
+The [mnist example](https://github.com/FluxML/model-zoo/blob/master/mnist/mlp.jl) contains the code needed to run the model on the GPU; just uncomment the lines after `using CuArrays`.
diff --git a/src/Flux.jl b/src/Flux.jl
index 179d09c2..522f83c5 100644
--- a/src/Flux.jl
+++ b/src/Flux.jl
@@ -18,6 +18,7 @@ export σ, sigmoid, relu, leakyrelu, elu, swish, softmax, logsoftmax,
 
 include("tracker/Tracker.jl")
 using .Tracker
+import .Tracker: data, value
 
 include("optimise/Optimise.jl")
 using .Optimise
diff --git a/src/tracker/Tracker.jl b/src/tracker/Tracker.jl
index aa2bc6ea..5686c7a2 100644
--- a/src/tracker/Tracker.jl
+++ b/src/tracker/Tracker.jl
@@ -65,7 +65,7 @@ value(x::TrackedScalar) = data(x)[]
 
 Base.:(==)(x::TrackedArray, y) = value(x) == y
 Base.:(==)(y, x::TrackedArray) = y == value(x)
-Base.:(==)(x::TrackedArray, y::TrackedArray) = value(x) == value(x)
+Base.:(==)(x::TrackedArray, y::TrackedArray) = value(x) == value(y)
 
 Base.isless(x::TrackedScalar, y) = isless(value(x), y)
 Base.isless(x, y::TrackedScalar) = isless(x, value(y))