diff --git a/src/DataDeps.jl b/src/DataDeps.jl
index 59011c6..8ec41fd 100644
--- a/src/DataDeps.jl
+++ b/src/DataDeps.jl
@@ -29,4 +29,12 @@ include("preupload.jl")
 include("fetch_helpers.jl")
 include("post_fetch_helpers.jl")
 
+
+function _precompile_()
+    ccall(:jl_generating_output, Cint, ()) == 1 || return nothing
+    Base.precompile(Tuple{typeof(resolve), DataDep, String, String})   # time: 0.007738324
+end
+
+_precompile_()
+
 end # module
diff --git a/src/types.jl b/src/types.jl
index 6dc8eb5..b4ffde4 100644
--- a/src/types.jl
+++ b/src/types.jl
@@ -15,12 +15,12 @@ struct ManualDataDep <: AbstractDataDep
     message::String
 end
 
-struct DataDep{H, R, F, P} <: AbstractDataDep
+struct DataDep <: AbstractDataDep
     name::String
-    remotepath::R
-    hash::H
-    fetch_method::F
-    post_fetch_method::P
+    remotepath
+    hash
+    fetch_method
+    post_fetch_method
     extra_message::String
 end