diff --git a/runtime/BUILD.gn b/runtime/BUILD.gn
index 919ee59af4a..9ef44448110 100644
--- a/runtime/BUILD.gn
+++ b/runtime/BUILD.gn
@@ -152,6 +152,7 @@ config("dart_config") {
       "-Wall",
       "-Wextra",  # Also known as -W.
       "-Wno-unused-parameter",
+      "-Wno-unused-private-field",
       "-Wnon-virtual-dtor",
       "-Wvla",
       "-Wno-conversion-null",
diff --git a/runtime/bin/dartutils.cc b/runtime/bin/dartutils.cc
index 92525081d64..9211fc0c337 100644
--- a/runtime/bin/dartutils.cc
+++ b/runtime/bin/dartutils.cc
@@ -801,9 +801,9 @@ Dart_Handle DartUtils::EnvironmentCallback(Dart_Handle name) {
 Dart_CObject CObject::api_null_ = {Dart_CObject_kNull, {0}};
 Dart_CObject CObject::api_true_ = {Dart_CObject_kBool, {true}};
 Dart_CObject CObject::api_false_ = {Dart_CObject_kBool, {false}};
-CObject CObject::null_ = CObject(&api_null_);
-CObject CObject::true_ = CObject(&api_true_);
-CObject CObject::false_ = CObject(&api_false_);
+CObject CObject::null_(&api_null_);
+CObject CObject::true_(&api_true_);
+CObject CObject::false_(&api_false_);
 
 CObject* CObject::Null() {
   return &null_;
diff --git a/runtime/platform/globals.h b/runtime/platform/globals.h
index 3078d075f34..be43b300f2d 100644
--- a/runtime/platform/globals.h
+++ b/runtime/platform/globals.h
@@ -531,8 +531,8 @@ inline double MicrosecondsToMilliseconds(int64_t micros) {
 #if !defined(DISALLOW_COPY_AND_ASSIGN)
 #define DISALLOW_COPY_AND_ASSIGN(TypeName)                                     \
  private:                                                                      \
-  TypeName(const TypeName&);                                                   \
-  void operator=(const TypeName&)
+  TypeName(const TypeName&) = delete;                                          \
+  void operator=(const TypeName&) = delete
 #endif  // !defined(DISALLOW_COPY_AND_ASSIGN)
 
 // A macro to disallow all the implicit constructors, namely the default
@@ -543,7 +543,7 @@ inline double MicrosecondsToMilliseconds(int64_t micros) {
 #if !defined(DISALLOW_IMPLICIT_CONSTRUCTORS)
 #define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName)                               \
  private:                                                                      \
-  TypeName();                                                                  \
+  TypeName() = delete;                                                         \
   DISALLOW_COPY_AND_ASSIGN(TypeName)
 #endif  // !defined(DISALLOW_IMPLICIT_CONSTRUCTORS)
 
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index 250aa7b3606..4eb21a0e138 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -166,10 +166,10 @@ class Symbols;
                                                                                \
  private: /* NOLINT */                                                         \
   void* operator new(size_t size);                                             \
-  object(const object& value);                                                 \
-  void operator=(Raw##super* value);                                           \
-  void operator=(const object& value);                                         \
-  void operator=(const super& value);
+  object(const object& value) = delete;                                        \
+  void operator=(Raw##super* value) = delete;                                  \
+  void operator=(const object& value) = delete;                                \
+  void operator=(const super& value) = delete;
 
 // Conditionally include object_service.cc functionality in the vtable to avoid
 // link errors like the following: