diff --git a/src/ForwardDiff.jl b/src/ForwardDiff.jl
index 073aca70..460818ff 100644
--- a/src/ForwardDiff.jl
+++ b/src/ForwardDiff.jl
@@ -1,3 +1,5 @@
+isdefined(Base, :__precompile__) && __precompile__()
+
 module ForwardDiff
 
     if VERSION < v"0.4-"