diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1bccb77cd47..e6efa0d11d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,9 @@ main() { foo(() {}); }
 
 ### Core libraries
 
+* Default values of parameters of abstract methods are no longer available
+  via `dart:mirrors`.
+
 ### Dart VM
 
 ### Tools
diff --git a/runtime/vm/kernel.cc b/runtime/vm/kernel.cc
index 0760b1f182e..73a3dfb21ae 100644
--- a/runtime/vm/kernel.cc
+++ b/runtime/vm/kernel.cc
@@ -571,7 +571,7 @@ class ParameterDescriptorBuilder : public KernelReaderHelper {
         type_translator_(this, active_class, /* finalize= */ true),
         constant_evaluator_(this, &type_translator_, active_class, nullptr) {}
 
-  RawObject* BuildParameterDescriptor(intptr_t kernel_offset);
+  RawObject* BuildParameterDescriptor(const Function& function);
 
  private:
   TypeTranslator type_translator_;
@@ -581,8 +581,8 @@ class ParameterDescriptorBuilder : public KernelReaderHelper {
 };
 
 RawObject* ParameterDescriptorBuilder::BuildParameterDescriptor(
-    intptr_t kernel_offset) {
-  SetOffset(kernel_offset);
+    const Function& function) {
+  SetOffset(function.kernel_offset());
   ReadUntilFunctionNode();
   FunctionNodeHelper function_node_helper(this);
   function_node_helper.ReadUntilExcluding(
@@ -610,17 +610,19 @@ RawObject* ParameterDescriptorBuilder::BuildParameterDescriptor(
                            helper.IsFinal() ? Bool::True() : Bool::False());
 
     Tag tag = ReadTag();  // read (first part of) initializer.
-    if (tag == kSomething) {
+    if ((tag == kSomething) && !function.is_abstract()) {
       // this will (potentially) read the initializer, but reset the position.
       Instance& constant = Instance::ZoneHandle(
           zone_, constant_evaluator_.EvaluateExpression(ReaderOffset()));
-      SkipExpression();  // read (actual) initializer.
       param_descriptor.SetAt(entry_start + Parser::kParameterDefaultValueOffset,
                              constant);
     } else {
       param_descriptor.SetAt(entry_start + Parser::kParameterDefaultValueOffset,
                              Object::null_instance());
     }
+    if (tag == kSomething) {
+      SkipExpression();  // read (actual) initializer.
+    }
 
     if (FLAG_enable_mirrors && (helper.annotation_count_ > 0)) {
       AlternativeReadingScope alt(&reader_, param_kernel_offset);
@@ -665,7 +667,7 @@ RawObject* BuildParameterDescriptor(const Function& function) {
         ExternalTypedData::Handle(zone, function.KernelData()),
         function.KernelDataProgramOffset(), &active_class);
 
-    return builder.BuildParameterDescriptor(function.kernel_offset());
+    return builder.BuildParameterDescriptor(function);
   } else {
     return Thread::Current()->StealStickyError();
   }
diff --git a/tests/lib_2/mirrors/parameter_abstract_test.dart b/tests/lib_2/mirrors/parameter_abstract_test.dart
index 298f5e9a21f..252d9e5222f 100644
--- a/tests/lib_2/mirrors/parameter_abstract_test.dart
+++ b/tests/lib_2/mirrors/parameter_abstract_test.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// BOGUS: Note that both AST and bytecode modes are missing default values.
-
 import 'dart:mirrors';
 
 import 'package:expect/expect.dart';
@@ -23,12 +21,12 @@ main() {
   MethodMirror foo1 = cm.declarations[#foo1];
   expect('Method(s(foo1) in s(C), abstract)', foo1);
   expect(
-      'Parameter(s(x) in s(foo1), optional, named, value = Instance(value = 1), type = Class(s(int) in s(dart.core), top-level))',
+      'Parameter(s(x) in s(foo1), optional, named, type = Class(s(int) in s(dart.core), top-level))',
       foo1.parameters[0]);
   expect(
-      'Parameter(s(y) in s(foo1), optional, named, value = Instance(value = 2), type = Class(s(int) in s(dart.core), top-level))',
+      'Parameter(s(y) in s(foo1), optional, named, type = Class(s(int) in s(dart.core), top-level))',
       foo1.parameters[1]);
   expect(
-      'Parameter(s(z) in s(foo1), optional, named, value = Instance(value = 3), type = Class(s(int) in s(dart.core), top-level))',
+      'Parameter(s(z) in s(foo1), optional, named, type = Class(s(int) in s(dart.core), top-level))',
       foo1.parameters[2]);
 }
diff --git a/tests/lib_2/mirrors/stringify.dart b/tests/lib_2/mirrors/stringify.dart
index b7268326f02..6ff5c3f52c2 100644
--- a/tests/lib_2/mirrors/stringify.dart
+++ b/tests/lib_2/mirrors/stringify.dart
@@ -175,7 +175,7 @@ String stringify(value) {
   throw 'Unexpected value: $value';
 }
 
-expect(expected, actual, [String reason]) {
+expect(expected, actual, [String reason = ""]) {
   Expect.stringEquals(expected, stringify(actual), reason);
 }