diff --git a/webrtc/modules/audio_coding/main/acm2/acm_isac.cc b/webrtc/modules/audio_coding/main/acm2/acm_isac.cc
index 2adae861b2..e12255957f 100644
--- a/webrtc/modules/audio_coding/main/acm2/acm_isac.cc
+++ b/webrtc/modules/audio_coding/main/acm2/acm_isac.cc
@@ -736,7 +736,7 @@ int ACMISAC::Decode(const uint8_t* encoded,
                     size_t encoded_len,
                     int16_t* decoded,
                     SpeechType* speech_type) {
-  int16_t temp_type;
+  int16_t temp_type = 1;  // Default is speech.
   CriticalSectionScoped lock(codec_inst_crit_sect_.get());
   int ret =
       ACM_ISAC_DECODE_B(static_cast<ACM_ISAC_STRUCT*>(codec_inst_ptr_->inst),