diff --git a/src/OptiMimi.jl b/src/OptiMimi.jl
index 85b7331..9445158 100644
--- a/src/OptiMimi.jl
+++ b/src/OptiMimi.jl
@@ -1,7 +1,7 @@
 module OptiMimi
 
 using NLopt
-using ForwardDiff
+using ForwardDiff, DiffBase
 using MathProgBase
 using Compat
 
@@ -106,13 +106,13 @@ function autodiffobjective(model::Model, components::Vector{Symbol}, names::Vect
         end
     else
         function myobjective(xx::Vector, grad::Vector)
-            out = GradientResult(xx)
+            out = DiffBase.GradientResult(xx)
             ForwardDiff.gradient!(out, myunaryobjective, xx)
-            if any(isnan(ForwardDiff.gradient(out)))
+            if any(isnan(DiffBase.gradient(out)))
                 error("objective gradient is NaN")
             end
-            copy!(grad, ForwardDiff.gradient(out))
-            ForwardDiff.value(out)
+            copy!(grad, DiffBase.gradient(out))
+            DiffBase.value(out)
         end
     end