diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 57defdc793..ffad40691a 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -134,10 +134,10 @@ DEFINE_bool(deoptimize_uncommon_cases, true, "deoptimize uncommon cases")
 DEFINE_bool(polymorphic_inlining, true, "polymorphic inlining")
 DEFINE_bool(aggressive_loop_invariant_motion, true,
             "aggressive motion of instructions out of loops")
-#ifdef V8_TARGET_ARCH_IA32
-DEFINE_bool(use_osr, true, "use on-stack replacement")
-#else
+#ifdef V8_TARGET_ARCH_X64
 DEFINE_bool(use_osr, false, "use on-stack replacement")
+#else
+DEFINE_bool(use_osr, true, "use on-stack replacement")
 #endif
 DEFINE_bool(trace_osr, false, "trace on-stack replacement")
 DEFINE_int(stress_runs, 0, "number of stress runs")