diff --git a/qualtran/cirq_interop/t_complexity_protocol.py b/qualtran/cirq_interop/t_complexity_protocol.py
index 759ca18999..5ee882a1d8 100644
--- a/qualtran/cirq_interop/t_complexity_protocol.py
+++ b/qualtran/cirq_interop/t_complexity_protocol.py
@@ -94,9 +94,7 @@ def _is_clifford_or_t(stc: Any, fail_quietly: bool) -> Optional[TComplexity]:
     if not isinstance(stc, (cirq.Gate, cirq.Operation)):
         return None
 
-    if isinstance(stc, cirq.GlobalPhaseGate) or (
-        isinstance(stc, cirq.Operation) and isinstance(stc.gate, cirq.GlobalPhaseGate)
-    ):
+    if isinstance(stc, cirq.Operation) and isinstance(stc.gate, cirq.GlobalPhaseGate):
         return TComplexity()
 
     if isinstance(stc, cirq.ClassicallyControlledOperation):