diff --git a/bindings/python/quokka/block.py b/bindings/python/quokka/block.py
index bcb5e64..49196ef 100644
--- a/bindings/python/quokka/block.py
+++ b/bindings/python/quokka/block.py
@@ -243,7 +243,7 @@ def bytes(self) -> bytes:
 
         return block_bytes
 
-    @property
+    @cached_property
     def pcode_insts(self) -> List[pypcode.PcodeOp]:
         """Generate PCode instructions for the block