diff --git a/grudge/models/wave.py b/grudge/models/wave.py
index 0ac60a336a4f72f12ba4f3eeb0bc2d79c9f07509..6defafc878f856fe83449b12dc055cfdf0b1f432 100644
--- a/grudge/models/wave.py
+++ b/grudge/models/wave.py
@@ -163,7 +163,9 @@ class StrongWaveOperator(HyperbolicOperator):
                         + flux(sym.bv_tpair(self.dirichlet_tag, w, dir_bc))
                         + flux(sym.bv_tpair(self.neumann_tag, w, neu_bc))
                         + flux(sym.bv_tpair(self.radiation_tag, w, rad_bc))
-                        )))
+                        )
+                    )
+                )
 
         result[0] += self.source_f