diff --git a/modules/audio_processing/audio_frame_view_unittest.cc b/modules/audio_processing/audio_frame_view_unittest.cc
index cf3049688e..7a9d126103 100644
--- a/modules/audio_processing/audio_frame_view_unittest.cc
+++ b/modules/audio_processing/audio_frame_view_unittest.cc
@@ -13,6 +13,7 @@
 #include "modules/audio_processing/audio_buffer.h"
 #include "test/gtest.h"
 
+namespace webrtc {
 TEST(AudioFrameTest, ConstructFromAudioBuffer) {
   constexpr int kSampleRateHz = 48000;
   constexpr int kNumChannels = 2;
@@ -47,3 +48,4 @@ TEST(AudioFrameTest, ConstructFromAudioBuffer) {
   non_const_int16_view.channel(0)[0] = kIntConstant;
   EXPECT_EQ(buffer.channels()[0][0], kIntConstant);
 }
+}  // namespace webrtc
diff --git a/modules/audio_processing/include/audio_frame_view.h b/modules/audio_processing/include/audio_frame_view.h
index 366fc32660..ab5779ad6b 100644
--- a/modules/audio_processing/include/audio_frame_view.h
+++ b/modules/audio_processing/include/audio_frame_view.h
@@ -13,6 +13,8 @@
 
 #include "api/array_view.h"
 
+namespace webrtc {
+
 // Class to pass audio data in T** format, where T is a numeric type.
 template <class T>
 class AudioFrameView {
@@ -60,5 +62,6 @@ class AudioFrameView {
   size_t num_channels_;
   size_t channel_size_;
 };
+}  // namespace webrtc
 
 #endif  // MODULES_AUDIO_PROCESSING_INCLUDE_AUDIO_FRAME_VIEW_H_