diff --git a/compiler/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index 84863e4..bb33ba3 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -530,7 +530,8 @@
         OptDef(OptimizationPass::kSideEffectsAnalysis),
         OptDef(OptimizationPass::kGlobalValueNumbering, "GVN$after_arch"),
         OptDef(OptimizationPass::kPcRelativeFixupsX86),
-        OptDef(OptimizationPass::kX86MemoryOperandGeneration)
+        OptDef(OptimizationPass::kX86MemoryOperandGeneration),
+        OptDef(OptimizationPass::kInstructionSimplifierX86)
       };
       return RunOptimizations(graph,
                               codegen,
@@ -545,7 +546,8 @@
       OptimizationDef x86_64_optimizations[] = {
         OptDef(OptimizationPass::kSideEffectsAnalysis),
         OptDef(OptimizationPass::kGlobalValueNumbering, "GVN$after_arch"),
-        OptDef(OptimizationPass::kX86MemoryOperandGeneration)
+        OptDef(OptimizationPass::kX86MemoryOperandGeneration),
+        OptDef(OptimizationPass::kInstructionSimplifierX86)
       };
       return RunOptimizations(graph,
                               codegen,