diff --git a/pystencils/backends/cbackend.py b/pystencils/backends/cbackend.py
index 9efca1f53a6870d2b0ce2bdd1da547d16beb6a6c..6f203837d4024a6d2e1deeea7e6efdc6555a7947 100644
--- a/pystencils/backends/cbackend.py
+++ b/pystencils/backends/cbackend.py
@@ -91,7 +91,7 @@ def get_global_declarations(ast):
 
     visit_node(ast)
 
-    return sorted(set(global_declarations), key=lambda x: str(x))
+    return sorted(set(global_declarations), key=str)
 
 
 def get_headers(ast_node: Node) -> Set[str]: