diff --git a/test/cuda/linalg.jl b/test/cuda/linalg.jl
index 753f3b0..79eb621 100644
--- a/test/cuda/linalg.jl
+++ b/test/cuda/linalg.jl
@@ -119,6 +119,7 @@ T = Float32
         @test eltype(NL) == T
 
         SL = GraphSignals.scaled_laplacian(fg, T)
+        @test SL isa CuMatrix{T}
         @test collect(SL) ≈ T.(scaled_lap)
         @test eltype(SL) == T