diff --git a/test/runtests.jl b/test/runtests.jl
index f91f8793f73346eee940d74ae28ab3faf7ab74ca..3f7ca2d746492329c9c825a960a4fe977e6d7526 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -31,7 +31,7 @@ end
 
 @testset "mesh refinement" begin
     # simple hashing
-    val(f) = integrate(f.space.mesh, (x; f) -> dot(f, f); f)
+    val(f) = integrate(f.space.mesh, (x; f) -> sum(f .* f); f)
 
     mesh = init_grid(zeros(5, 5))