diff --git a/tests/agent/test_turn_context_overflow_warning.py b/tests/agent/test_turn_context_overflow_warning.py
index b63a6c8330cc6..c5b7722f2293a 100644
--- a/tests/agent/test_turn_context_overflow_warning.py
+++ b/tests/agent/test_turn_context_overflow_warning.py
@@ -34,7 +34,10 @@ def _make_compressor(**kwargs) -> ContextCompressor:
     # 96K context -> small-context floor raises threshold_percent to 0.75,
     # so threshold_tokens = 72_000. 73_000 is "over threshold".
     with patch("agent.context_compressor.get_model_context_length", return_value=96000):
-        return ContextCompressor(**defaults)
+        comp = ContextCompressor(**defaults)
+        # Resolve while the mock is active (lazy init, #32221).
+        _ = comp.context_length
+        return comp
 
 
 class TestShouldCompressInfo: