diff --git a/src/imagination/csbgen/gen_pack_header.py b/src/imagination/csbgen/gen_pack_header.py
index 501caccd9df..2626d1faeb8 100644
--- a/src/imagination/csbgen/gen_pack_header.py
+++ b/src/imagination/csbgen/gen_pack_header.py
@@ -505,6 +505,7 @@ class Condition(Node):
 
         return fields
 
+    @staticmethod
     def _is_valid_type(ty):
         types = {"if", "elif", "else", "endif"}
         return ty in types