diff --git a/compiler/dex/frontend.cc b/compiler/dex/frontend.cc
index 63e3831..9bad736 100644
--- a/compiler/dex/frontend.cc
+++ b/compiler/dex/frontend.cc
@@ -879,8 +879,9 @@
         (1 << kPromoteCompilerTemps));
   }
 
-  if (cu.instruction_set == kArm64) {
+  if (cu.instruction_set == kArm64 || cu.instruction_set == kX86_64) {
     // TODO(Arm64): enable optimizations once backend is mature enough.
+    // TODO(X86_64): enable optimizations once backend is mature enough.
     cu.disable_opt = ~(uint32_t)0;
     cu.enable_debug |= (1 << kDebugCodegenDump);
   }