diff --git a/src/objective/lambdarank_obj.cu b/src/objective/lambdarank_obj.cu
index a6353678b182..110e4ae87914 100644
--- a/src/objective/lambdarank_obj.cu
+++ b/src/objective/lambdarank_obj.cu
@@ -441,7 +441,6 @@ void LambdaRankGetGradientMAP(Context const* ctx, std::int32_t iter,
                               linalg::VectorView<double const> tj_minus,  // input bias ratio
                               linalg::VectorView<double> li, linalg::VectorView<double> lj,
                               HostDeviceVector<GradientPair>* out_gpair) {
-  auto const* cuctx = ctx->CUDACtx();
   std::int32_t device_id = ctx->gpu_id;
   dh::safe_cuda(cudaSetDevice(device_id));
 
@@ -481,7 +480,6 @@ void LambdaRankGetGradientPairwise(Context const* ctx, std::int32_t iter,
                                    linalg::VectorView<double const> tj_minus,  // input bias ratio
                                    linalg::VectorView<double> li, linalg::VectorView<double> lj,
                                    HostDeviceVector<GradientPair>* out_gpair) {
-  auto const* cuctx = ctx->CUDACtx();
   std::int32_t device_id = ctx->gpu_id;
   dh::safe_cuda(cudaSetDevice(device_id));