diff --git a/Project.toml b/Project.toml
index 1ff522a82..af3b030ab 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "ChainRulesCore"
 uuid = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
-version = "0.9.40"
+version = "0.9.41"
 
 [deps]
 Compat = "34da2185-b29b-5c13-b0c7-acf172513d20"
diff --git a/src/ChainRulesCore.jl b/src/ChainRulesCore.jl
index 35ff8ffe1..48c2be9e4 100644
--- a/src/ChainRulesCore.jl
+++ b/src/ChainRulesCore.jl
@@ -30,4 +30,6 @@ include("rules.jl")
 include("rule_definition_tools.jl")
 include("ruleset_loading.jl")
 
+include("precompile.jl")
+
 end # module
diff --git a/src/precompile.jl b/src/precompile.jl
new file mode 100644
index 000000000..ba4e72c8d
--- /dev/null
+++ b/src/precompile.jl
@@ -0,0 +1 @@
+precompile(_package_hook, (Base.PkgId,))
diff --git a/src/ruleset_loading.jl b/src/ruleset_loading.jl
index 2b8b91cea..aa40fae26 100644
--- a/src/ruleset_loading.jl
+++ b/src/ruleset_loading.jl
@@ -1,7 +1,8 @@
 # Infastructure to support generating overloads from rules.
+_package_hook(::Base.PkgId) = refresh_rules()
 function __init__()
     # Need to refresh rules when a package is loaded
-    push!(Base.package_callbacks, pkgid -> refresh_rules())
+    push!(Base.package_callbacks, _package_hook)
 end
 
 # Holds all the hook functions that are invokes when a new rule is defined