diff --git a/Project.toml b/Project.toml
index edfb55d9..d2bc4d2a 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "ForwardDiff"
 uuid = "f6369f11-7733-5829-9624-2563aa707210"
-version = "0.10.19"
+version = "0.10.20"
 
 [deps]
 CommonSubexpressions = "bbf7d656-a473-5ed7-a52c-81e309532950"
diff --git a/src/dual.jl b/src/dual.jl
index 81745f07..15499020 100644
--- a/src/dual.jl
+++ b/src/dual.jl
@@ -383,6 +383,10 @@ Base.convert(::Type{D}, d::D) where {D<:Dual} = d
 Base.float(d::Dual{T,V,N}) where {T,V,N} = convert(Dual{T,promote_type(V, Float16),N}, d)
 Base.AbstractFloat(d::Dual{T,V,N}) where {T,V,N} = convert(Dual{T,promote_type(V, Float16),N}, d)
 
+for F in (:Float16, :Float32, :Float64)
+    @eval @inline Base.$F(d::Dual{T,V,N}) where {T,V,N} = convert(Dual{T,promote_type(V, $F),N}, d)
+end
+
 ###################################
 # General Mathematical Operations #
 ###################################
diff --git a/test/DerivativeTest.jl b/test/DerivativeTest.jl
index f5645a7e..c309cded 100644
--- a/test/DerivativeTest.jl
+++ b/test/DerivativeTest.jl
@@ -100,4 +100,8 @@ end
     @test_throws DimensionMismatch ForwardDiff.derivative(sum, fill(2pi, 3))
 end
 
+@testset "function that calls a floating point constructor" begin
+    @test ForwardDiff.derivative(x->2*Float32(x), 3) === 2f0
+end
+
 end # module
diff --git a/test/DualTest.jl b/test/DualTest.jl
index 285fe3ab..365a399c 100644
--- a/test/DualTest.jl
+++ b/test/DualTest.jl
@@ -517,6 +517,12 @@ end
     @test length(UnitRange(Dual(1.5), Dual(3.5))) == 3
     @test length(UnitRange(Dual(1.5,1), Dual(3.5,3))) == 3
 end
+
+@testset "Float" begin
+    for F in (Float16, Float32, Float64)
+        @test F(Dual(3, 5)) == Dual(F(3), F(5))
+    end
+end
   
 if VERSION >= v"1.6.0-rc1"
     @testset "@printf" begin