diff --git a/compiler/optimizing/optimization.h b/compiler/optimizing/optimization.h
index 4a515bc..f8aea96 100644
--- a/compiler/optimizing/optimization.h
+++ b/compiler/optimizing/optimization.h
@@ -66,6 +66,7 @@
 // field is preferred over a string lookup at places where performance matters.
 // TODO: generate this table and lookup methods below automatically?
 enum class OptimizationPass {
+  kAggressiveInstructionSimplifier,
   kBoundsCheckElimination,
   kCHAGuardOptimization,
   kCodeSinking,