diff --git a/Project.toml b/Project.toml
index a3b2c3d26..bd8155f02 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "ChainRulesCore"
 uuid = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
-version = "1.8.0"
+version = "1.9.0"
 
 [deps]
 Compat = "34da2185-b29b-5c13-b0c7-acf172513d20"
diff --git a/src/tangent_types/thunks.jl b/src/tangent_types/thunks.jl
index e065bea62..41c9d6628 100644
--- a/src/tangent_types/thunks.jl
+++ b/src/tangent_types/thunks.jl
@@ -196,6 +196,7 @@ end
 Base.show(io::IO, x::Thunk) = print(io, "Thunk($(repr(x.f)))")
 
 Base.convert(::Type{<:Thunk}, a::AbstractZero) = @thunk(a)
+Base.convert(::Type{T}, t::AbstractThunk) where {T} = convert(T, unthunk(t))
 
 """
     InplaceableThunk(add!::Function, val::Thunk)
diff --git a/test/tangent_types/thunks.jl b/test/tangent_types/thunks.jl
index af4a747d1..597d6022c 100644
--- a/test/tangent_types/thunks.jl
+++ b/test/tangent_types/thunks.jl
@@ -24,6 +24,7 @@
 
     @testset "convert" begin
         @test convert(Thunk, ZeroTangent()) isa Thunk
+        @test convert(Float64, @thunk(2.2)) isa Float64
     end
 
     @testset "unthunk" begin