diff --git a/src/acc/cuda/cuda_utils_cub.cuh b/src/acc/cuda/cuda_utils_cub.cuh
index 3a6d7425f..3e32fb862 100644
--- a/src/acc/cuda/cuda_utils_cub.cuh
+++ b/src/acc/cuda/cuda_utils_cub.cuh
@@ -12,6 +12,8 @@
 #if(defined(CubLog) && defined(__CUDA_ARCH__) && (__CUDA_ARCH__<= 520)) // Intetionally force a warning for new arch
 	#undef CubLog
 #endif
+
+#define CUB_NS_QUALIFIER ::cub # for compatibility with CUDA 11.5
 #include "src/acc/cuda/cub/device/device_radix_sort.cuh"
 #include "src/acc/cuda/cub/device/device_reduce.cuh"
 #include "src/acc/cuda/cub/device/device_scan.cuh"