diff --git a/hypothesis-python/src/hypothesis/internal/conjecture/engine.py b/hypothesis-python/src/hypothesis/internal/conjecture/engine.py
index 047100f911..d154fdc28e 100644
--- a/hypothesis-python/src/hypothesis/internal/conjecture/engine.py
+++ b/hypothesis-python/src/hypothesis/internal/conjecture/engine.py
@@ -254,7 +254,7 @@ def _cache_key_ir(self, *, nodes=None, data=None):
 
         # intentionally drop was_forced from equality here, because the was_forced
         # of node prefixes on ConjectureData has no impact on that data's result
-        key = tuple(
+        return tuple(
             (
                 node.ir_type,
                 ir_value_key(node.ir_type, node.value),
@@ -262,7 +262,6 @@ def _cache_key_ir(self, *, nodes=None, data=None):
             )
             for node in nodes + extension
         )
-        return key
 
     def _cache(self, data):
         result = data.as_result()
diff --git a/hypothesis-python/tests/conjecture/test_engine.py b/hypothesis-python/tests/conjecture/test_engine.py
index ab842c0c0e..807e385880 100644
--- a/hypothesis-python/tests/conjecture/test_engine.py
+++ b/hypothesis-python/tests/conjecture/test_engine.py
@@ -28,7 +28,8 @@
 from hypothesis.errors import FailedHealthCheck, Flaky
 from hypothesis.internal.compat import int_from_bytes
 from hypothesis.internal.conjecture import engine as engine_module
-from hypothesis.internal.conjecture.data import ConjectureData, Overrun, Status, IRNode
+from hypothesis.internal.conjecture.data import ConjectureData, IRNode, Overrun, Status
+from hypothesis.internal.conjecture.datatree import compute_max_children
 from hypothesis.internal.conjecture.engine import (
     MIN_TEST_CALLS,
     ConjectureRunner,
@@ -39,7 +40,6 @@
 from hypothesis.internal.conjecture.pareto import DominanceRelation, dominance
 from hypothesis.internal.conjecture.shrinker import Shrinker, block_program
 from hypothesis.internal.entropy import deterministic_PRNG
-from hypothesis.internal.conjecture.datatree import compute_max_children
 
 from tests.common.debug import minimal
 from tests.common.strategies import SLOW, HardToShrink