diff --git a/rtc_base/copy_on_write_buffer.cc b/rtc_base/copy_on_write_buffer.cc
index 850327b088..d8ab53cb24 100644
--- a/rtc_base/copy_on_write_buffer.cc
+++ b/rtc_base/copy_on_write_buffer.cc
@@ -23,7 +23,7 @@ CopyOnWriteBuffer::CopyOnWriteBuffer() : offset_(0), size_(0) {
 CopyOnWriteBuffer::CopyOnWriteBuffer(const CopyOnWriteBuffer& buf)
     : buffer_(buf.buffer_), offset_(buf.offset_), size_(buf.size_) {}
 
-CopyOnWriteBuffer::CopyOnWriteBuffer(CopyOnWriteBuffer&& buf)
+CopyOnWriteBuffer::CopyOnWriteBuffer(CopyOnWriteBuffer&& buf) noexcept
     : buffer_(std::move(buf.buffer_)), offset_(buf.offset_), size_(buf.size_) {
   buf.offset_ = 0;
   buf.size_ = 0;
diff --git a/rtc_base/copy_on_write_buffer.h b/rtc_base/copy_on_write_buffer.h
index 849f5f5df2..af6e868d7d 100644
--- a/rtc_base/copy_on_write_buffer.h
+++ b/rtc_base/copy_on_write_buffer.h
@@ -36,7 +36,7 @@ class RTC_EXPORT CopyOnWriteBuffer {
   // Share the data with an existing buffer.
   CopyOnWriteBuffer(const CopyOnWriteBuffer& buf);
   // Move contents from an existing buffer.
-  CopyOnWriteBuffer(CopyOnWriteBuffer&& buf);
+  CopyOnWriteBuffer(CopyOnWriteBuffer&& buf) noexcept;
 
   // Construct a buffer from a string, convenient for unittests.
   explicit CopyOnWriteBuffer(absl::string_view s);
diff --git a/rtc_base/copy_on_write_buffer_unittest.cc b/rtc_base/copy_on_write_buffer_unittest.cc
index ad2c4e0fba..8a9fc4e2f4 100644
--- a/rtc_base/copy_on_write_buffer_unittest.cc
+++ b/rtc_base/copy_on_write_buffer_unittest.cc
@@ -52,6 +52,8 @@ TEST(CopyOnWriteBufferTest, TestCreateEmptyData) {
 }
 
 TEST(CopyOnWriteBufferTest, TestMoveConstruct) {
+  EXPECT_TRUE(std::is_nothrow_move_constructible_v<CopyOnWriteBuffer>);
+
   CopyOnWriteBuffer buf1(kTestData, 3, 10);
   size_t buf1_size = buf1.size();
   size_t buf1_capacity = buf1.capacity();