diff --git a/src/core.jl b/src/core.jl
index 53d4cde..1645219 100644
--- a/src/core.jl
+++ b/src/core.jl
@@ -76,7 +76,7 @@ isrequired(a::Action) = (a.recipient.value != nothing) && a.recipient.value.aliv
 Signal{T}(x::T, parents=(); name::String=auto_name!("input")) = Signal{T}(x, parents, Action[], true, Dict{Signal, Int}(), name)
 Signal{T}(::Type{T}, x, parents=(); name::String=auto_name!("input")) = Signal{T}(x, parents, Action[], true, Dict{Signal, Int}(), name)
 # A signal of types
-Signal(t::Type; name::String = auto_name!("input")) = Signal(Type, t, name)
+Signal{T}(t::Type{T}; name::String = auto_name!("input")) = Signal(Type{T}, t, name = name)
 
 # preserve/unpreserve nodes from gc
 """
diff --git a/test/basics.jl b/test/basics.jl
index f44d41f..d780f8e 100644
--- a/test/basics.jl
+++ b/test/basics.jl
@@ -8,6 +8,8 @@ number() = round(Int, rand()*1000)
 ## Basics
 
 facts("Basic checks") do
+    x = Signal(Float32)
+    @fact isa(x, Signal{Type{Float32}}) --> true
 
     a = Signal(number())
     b = map(x -> x*x, a)