diff --git a/modules/audio_coding/neteq/audio_decoder_unittest.cc b/modules/audio_coding/neteq/audio_decoder_unittest.cc
index 1b92d18cf1..79e989e71d 100644
--- a/modules/audio_coding/neteq/audio_decoder_unittest.cc
+++ b/modules/audio_coding/neteq/audio_decoder_unittest.cc
@@ -589,6 +589,8 @@ TEST_F(AudioDecoderIsacFixTest, EncodeDecode) {
   static const int kEncodedBytes = 685;
 #elif defined(WEBRTC_ARCH_ARM64)
   static const int kEncodedBytes = 673;
+#elif defined(WEBRTC_MAC) && defined(WEBRTC_ARCH_ARM64)  // M1 Mac
+  static const int kEncodedBytes = 673;
 #else
   static const int kEncodedBytes = 671;
 #endif