diff --git a/runtime/vm/compiler/jit/jit_call_specializer.cc b/runtime/vm/compiler/jit/jit_call_specializer.cc
index 191e6bb..3afc611 100644
--- a/runtime/vm/compiler/jit/jit_call_specializer.cc
+++ b/runtime/vm/compiler/jit/jit_call_specializer.cc
@@ -162,57 +162,6 @@
   }
 }
 
-void JitCallSpecializer::VisitStoreInstanceField(
-    StoreInstanceFieldInstr* instr) {
-  if (instr->IsUnboxedDartFieldStore()) {
-    // Determine if this field should be unboxed based on the usage of getter
-    // and setter functions: The heuristic requires that the setter has a
-    // usage count of at least 1/kGetterSetterRatio of the getter usage count.
-    // This is to avoid unboxing fields where the setter is never or rarely
-    // executed.
-    const Field& field = instr->slot().field();
-    const String& field_name = String::Handle(Z, field.name());
-    const Class& owner = Class::Handle(Z, field.Owner());
-    const Function& getter =
-        Function::Handle(Z, owner.LookupGetterFunction(field_name));
-    const Function& setter =
-        Function::Handle(Z, owner.LookupSetterFunction(field_name));
-    bool unboxed_field = false;
-    if (!getter.IsNull() && !setter.IsNull()) {
-      if (field.is_double_initialized()) {
-        unboxed_field = true;
-      } else if ((setter.usage_counter() > 0) &&
-                 ((FLAG_getter_setter_ratio * setter.usage_counter()) >=
-                  getter.usage_counter())) {
-        unboxed_field = true;
-      }
-    }
-    if (!unboxed_field) {
-      if (FLAG_trace_optimization || FLAG_trace_field_guards) {
-        THR_Print("Disabling unboxing of %s\n", field.ToCString());
-        if (!setter.IsNull()) {
-          THR_Print("  setter usage count: %" Pd "\n", setter.usage_counter());
-        }
-        if (!getter.IsNull()) {
-          THR_Print("  getter usage count: %" Pd "\n", getter.usage_counter());
-        }
-      }
-      // We determined it's not beneficial for performance to unbox the
-      // field, therefore we mark it as boxed here.
-      //
-      // Calling `DisableFieldUnboxing` will cause transition the field to
-      // boxed and deoptimize dependent code.
-      //
-      // NOTE: It will also, as a side-effect, change our field clone's
-      // `is_unboxing_candidate()` bit. So we assume the compiler has so far
-      // not relied on this bit.
-      field.DisableFieldUnboxing();
-    } else {
-      flow_graph()->parsed_function().AddToGuardedFields(&field);
-    }
-  }
-}
-
 // Replace generic context allocation or cloning with a sequence of inlined
 // allocation and explicit initializing stores.
 // If context_value is not NULL then newly allocated context is a populated
diff --git a/runtime/vm/compiler/jit/jit_call_specializer.h b/runtime/vm/compiler/jit/jit_call_specializer.h
index 8c743ed..ecbee73 100644
--- a/runtime/vm/compiler/jit/jit_call_specializer.h
+++ b/runtime/vm/compiler/jit/jit_call_specializer.h
@@ -27,7 +27,6 @@
   // Find a better place for them.
   virtual void VisitAllocateContext(AllocateContextInstr* instr);
   virtual void VisitCloneContext(CloneContextInstr* instr);
-  virtual void VisitStoreInstanceField(StoreInstanceFieldInstr* instr);
 
  private:
   virtual bool IsAllowedForInlining(intptr_t deopt_id) const;
diff --git a/runtime/vm/flag_list.h b/runtime/vm/flag_list.h
index 679bf26..edf42f7 100644
--- a/runtime/vm/flag_list.h
+++ b/runtime/vm/flag_list.h
@@ -125,8 +125,6 @@
   P(enable_ffi, bool, true, "Disable to make importing dart:ffi an error.")    \
   P(force_clone_compiler_objects, bool, false,                                 \
     "Force cloning of objects needed in compiler (ICData and Field).")         \
-  P(getter_setter_ratio, int, 13,                                              \
-    "Ratio of getter/setter usage used for double field unboxing heuristics")  \
   P(guess_icdata_cid, bool, true,                                              \
     "Artificially create type feedback for arithmetic etc. operations")        \
   P(huge_method_cutoff_in_tokens, int, 20000,                                  \