diff --git a/loopy/symbolic.py b/loopy/symbolic.py
index 3311d23165b5f34f16c0c745218fd7da3a0ad2ac..d65440d57005183b2756040473080337257c5b52 100644
--- a/loopy/symbolic.py
+++ b/loopy/symbolic.py
@@ -153,7 +153,8 @@ class UnidirectionalUnifier(UnidirectionalUnifierBase):
         if not isinstance(other, type(expr)):
             return self.treat_mismatch(expr, other, unis)
         if (expr.inames != other.inames
-                or type(expr.operation) != type(other.operation)):
+                or type(expr.operation) != type(other.operation)  # noqa
+                ):
             return []
 
         return self.rec(expr.expr, other.expr, unis)