Fix comparison warning

diff --git a/include/deal.II/matrix_free/cuda_matrix_free.templates.h b/include/deal.II/matrix_free/cuda_matrix_free.templates.h
index ba9f6283ec6c3d13ea9eebe5c912e723fdebc171..a4ce00591cbcc5076b65447269cc72ce0bead895 100644 (file)
--- a/include/deal.II/matrix_free/cuda_matrix_free.templates.h
+++ b/include/deal.II/matrix_free/cuda_matrix_free.templates.h
@@ -907,7 +907,7 @@ namespace CUDAWrappers
       {
         ++my_id;
         Assert(
-          my_id < mf_n_concurrent_objects,
+          my_id < static_cast<int>(mf_n_concurrent_objects),
           ExcMessage(
             "Maximum number of concurrents MatrixFree objects reached. Increase mf_n_concurrent_objects"));
         bool f = false;