diff --git a/src/Geometry/SkeletonTriangulations.jl b/src/Geometry/SkeletonTriangulations.jl
index a17221013..076203c47 100644
--- a/src/Geometry/SkeletonTriangulations.jl
+++ b/src/Geometry/SkeletonTriangulations.jl
@@ -230,7 +230,7 @@ function Interface(args...;kwargs...)
 end
 
 function InterfaceTriangulation(model::DiscreteModel,cells_in,cells_out)
-  cell_to_inout = fill(Int8(OUT),num_cells(model))
+  cell_to_inout = fill(Int8(0),num_cells(model))
   cell_to_inout[cells_in] .= IN
   cell_to_inout[cells_out] .= OUT
   InterfaceTriangulation(model,cell_to_inout)
diff --git a/test/GeometryTests/SkeletonTriangulationsTests.jl b/test/GeometryTests/SkeletonTriangulationsTests.jl
index 7446e8a44..d4b6bd793 100644
--- a/test/GeometryTests/SkeletonTriangulationsTests.jl
+++ b/test/GeometryTests/SkeletonTriangulationsTests.jl
@@ -126,4 +126,13 @@ partition = (3,3,3)
 oldmodel = CartesianDiscreteModel(domain,partition)
 oldstrian = SkeletonTriangulation(oldmodel)
 
+domain = (0,1,0,1)
+partition = (2,2)
+model = CartesianDiscreteModel(domain,partition)
+Ω1 = Interior(model,[2])
+Ω2 = Interior(model,[4])
+Γ12 = Interface(Ω1,Ω2)
+@test num_cells(Γ12) == 1
+
+
 end # module