diff --git a/pystencils/backends/cuda_backend.py b/pystencils/backends/cuda_backend.py
index d0b689393d8c5439fab803f28efcac5f3d97e38b..3c1a3cd8bf9629c0b003cc8b6c38693c4426e282 100644
--- a/pystencils/backends/cuda_backend.py
+++ b/pystencils/backends/cuda_backend.py
@@ -59,7 +59,7 @@ class CudaSympyPrinter(CustomSympyPrinter):
 
     def __init__(self):
         super(CudaSympyPrinter, self).__init__()
-        self.known_functions = CUDA_KNOWN_FUNCTIONS
+        self.known_functions.update(CUDA_KNOWN_FUNCTIONS)
 
     def _print_TextureAccess(self, node):