diff --git a/src/geometry_primitives.jl b/src/geometry_primitives.jl
index c004dba7..b4ab70d4 100644
--- a/src/geometry_primitives.jl
+++ b/src/geometry_primitives.jl
@@ -9,6 +9,13 @@ end
 ##
 # conversion & decompose
 convert_simplex(::Type{T}, x::T) where T = (x,)
+
+function convert_simplex(NFT::Type{NgonFace{N, T1}}, f::Union{NgonFace{N, T2}}) where {T1, T2, N}
+    return (convert(NFT, f),)
+end
+
+convert_simplex(NFT::Type{NgonFace{3,T}}, f::NgonFace{3,T2}) where {T, T2} = (convert(NFT, f),)
+
 """
     convert_simplex(::Type{Face{3}}, f::Face{N})
 
diff --git a/test/runtests.jl b/test/runtests.jl
index d46df950..6600d169 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -274,6 +274,12 @@ end
         @test meshuv isa GLUVMesh3D
         @test meshuvnormal isa GLNormalUVMesh3D
 
+        t = Tesselation(FRect2D(0, 0, 2, 2), (30, 30))
+        m = GeometryBasics.mesh(t, pointtype=Point3f0, facetype=QuadFace{Int})
+        m2 = GeometryBasics.mesh(m, facetype=QuadFace{GLIndex})
+        @test GeometryBasics.faces(m2) isa Vector{QuadFace{GLIndex}}
+        @test GeometryBasics.coordinates(m2) isa Vector{Point3f0}
+
     end
 
     @testset "Multi geometries" begin