diff --git a/loopy/transform/precompute.py b/loopy/transform/precompute.py
index 06cf83f9d9e6aeac68c1135a15c03f24cc1a6ac1..2a75e9deaedd8da61f3af1321a88137413f39426 100644
--- a/loopy/transform/precompute.py
+++ b/loopy/transform/precompute.py
@@ -226,7 +226,9 @@ class RuleInvocationReplacer(RuleAwareIdentityMapper):
 
             if self.replaced_something:
                 insn = insn.copy(
-                        depends_on=insn.depends_on | frozenset([self.compute_insn_id]))
+                        depends_on=(
+                            insn.depends_on
+                            | frozenset([self.compute_insn_id])))
 
             new_insns.append(insn)