diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 8bb3f7bbe..d03721891 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -153,7 +153,7 @@ jobs:
             -DKokkos_ENABLE_DEPRECATED_CODE_4=OFF \
             -DKokkos_ENABLE_DEPRECATION_WARNINGS=OFF \
             -DCMAKE_CXX_FLAGS="\
-              -Wall -Wextra -Wpedantic \
+              -Wall -Wextra -Wpedantic -Wno-sign-compare \
               -Werror=vla \
               -Werror=implicit-fallthrough \
               ${CMAKE_CXX_FLAGS}" \
diff --git a/include/ddc/kernels/splines/spline_builder.hpp b/include/ddc/kernels/splines/spline_builder.hpp
index 2002d2658..18dabd7bb 100644
--- a/include/ddc/kernels/splines/spline_builder.hpp
+++ b/include/ddc/kernels/splines/spline_builder.hpp
@@ -275,8 +275,8 @@ void SplineBuilder<
 operator()(
         ddc::ChunkSpan<double, ddc::DiscreteDomain<bsplines_type>, Layout, MemorySpace> spline,
         ddc::ChunkSpan<double, interpolation_domain_type, Layout, MemorySpace> vals,
-        std::optional<ddc::CDSpan1D> const derivs_xmin,
-        std::optional<ddc::CDSpan1D> const derivs_xmax) const
+        [[maybe_unused]] std::optional<ddc::CDSpan1D> const derivs_xmin,
+        [[maybe_unused]] std::optional<ddc::CDSpan1D> const derivs_xmax) const
 {
     assert(vals.template extent<interpolation_mesh_type>()
            == ddc::discrete_space<BSplines>().nbasis() - s_nbe_xmin - s_nbe_xmax);