diff --git a/pyopencl/clrandom.py b/pyopencl/clrandom.py
index aada2bd850d305735a62b67517cb4418d6fe7687..2471d8d26d801367f877d2d29481c55468ba12da 100644
--- a/pyopencl/clrandom.py
+++ b/pyopencl/clrandom.py
@@ -114,6 +114,10 @@ class RanluxGenerator:
             Added default value for `num_work_items`.
         """
 
+        from warnings import warn
+        warn("Ranlux random number generation is deprecated and will go away "
+                "in 2022.", DeprecationWarning, stacklevel=2)
+
         if luxury is None:
             luxury = 4