diff --git a/src/TupleTools.jl b/src/TupleTools.jl
index f5511a4..e55c893 100644
--- a/src/TupleTools.jl
+++ b/src/TupleTools.jl
@@ -250,7 +250,8 @@ end
 _sort(t::Tuple{Any}, lt=isless, by=identity, rev::Bool=false) = t
 _sort(t::Tuple{}, lt=isless, by=identity, rev::Bool=false) = t
 
-function _split(t::NTuple{N}) where N
+function _split(t::Tuple)
+    N = length(t)
     M = N>>1
     ntuple(i->t[i], M), ntuple(i->t[i+M], N-M)
 end
diff --git a/test/runtests.jl b/test/runtests.jl
index e40a4c2..976e1d1 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -77,3 +77,5 @@ end
 @test @inferred(TupleTools.diff(())) == ()
 @test @inferred(TupleTools.diff((1, ))) == ()
 @test @inferred(TupleTools.diff((1, 2, 3))) == (1, 1)
+
+@test TupleTools.sort((2,1,3.0)) === (1,2,3.0)
\ No newline at end of file