diff --git a/backends/tfhe-cuda-backend/cuda/src/pbs/programmable_bootstrap_classic.cu b/backends/tfhe-cuda-backend/cuda/src/pbs/programmable_bootstrap_classic.cu
index a77db81e19..bd5e1f33ec 100644
--- a/backends/tfhe-cuda-backend/cuda/src/pbs/programmable_bootstrap_classic.cu
+++ b/backends/tfhe-cuda-backend/cuda/src/pbs/programmable_bootstrap_classic.cu
@@ -656,6 +656,8 @@ void cuda_programmable_bootstrap_lwe_ciphertext_vector_64(
     uint32_t num_samples, uint32_t num_many_lut, uint32_t lut_stride) {
   if (base_log > 64)
     PANIC("Cuda error (classical PBS): base log should be <= 64")
+  if ((glwe_dimension + 1) * level_count > 8)
+    PANIC("Cuda error (multi-bit PBS): (k + 1)*l should be <= 8")
 
   pbs_buffer<uint64_t, CLASSICAL> *buffer =
       (pbs_buffer<uint64_t, CLASSICAL> *)mem_ptr;
diff --git a/backends/tfhe-cuda-backend/cuda/src/pbs/programmable_bootstrap_multibit.cu b/backends/tfhe-cuda-backend/cuda/src/pbs/programmable_bootstrap_multibit.cu
index b2a7f214e2..1610c12072 100644
--- a/backends/tfhe-cuda-backend/cuda/src/pbs/programmable_bootstrap_multibit.cu
+++ b/backends/tfhe-cuda-backend/cuda/src/pbs/programmable_bootstrap_multibit.cu
@@ -220,6 +220,8 @@ void cuda_multi_bit_programmable_bootstrap_lwe_ciphertext_vector_64(
 
   if (base_log > 64)
     PANIC("Cuda error (multi-bit PBS): base log should be <= 64")
+  if ((glwe_dimension + 1) * level_count > 8)
+    PANIC("Cuda error (multi-bit PBS): (k + 1)*l should be <= 8")
 
   pbs_buffer<uint64_t, MULTI_BIT> *buffer =
       (pbs_buffer<uint64_t, MULTI_BIT> *)mem_ptr;