diff --git a/hal/audio_extn/audio_extn.c b/hal/audio_extn/audio_extn.c
index b7f9f0d..d93bd70 100755
--- a/hal/audio_extn/audio_extn.c
+++ b/hal/audio_extn/audio_extn.c
@@ -45,6 +45,7 @@
 #include <fcntl.h>
 #include <cutils/properties.h>
 #include <log/log.h>
+#include <pthread.h>
 #include <unistd.h>
 #include <sched.h>
 
diff --git a/hal/audio_extn/gef.c b/hal/audio_extn/gef.c
index 69b1e41..3559f06 100644
--- a/hal/audio_extn/gef.c
+++ b/hal/audio_extn/gef.c
@@ -43,6 +43,7 @@
 #include <stdlib.h>
 #include <dlfcn.h>
 #include <math.h>
+#include <pthread.h>
 #include <cutils/properties.h>
 #include "audio_extn.h"
 #include "audio_hw.h"
diff --git a/hal/audio_extn/sndmonitor.c b/hal/audio_extn/sndmonitor.c
index 930c95e..5e5e9f7 100644
--- a/hal/audio_extn/sndmonitor.c
+++ b/hal/audio_extn/sndmonitor.c
@@ -50,6 +50,7 @@
 #include <pthread.h>
 #include <sys/stat.h>
 #include <sys/poll.h>
+#include <pthread.h>
 #include <cutils/list.h>
 #include <cutils/hashmap.h>
 #include <log/log.h>
diff --git a/hal/audio_extn/spkr_protection.c b/hal/audio_extn/spkr_protection.c
index 1badc1b..170607c 100644
--- a/hal/audio_extn/spkr_protection.c
+++ b/hal/audio_extn/spkr_protection.c
@@ -45,6 +45,7 @@
 #include <dlfcn.h>
 #include <math.h>
 #include <unistd.h>
+#include <pthread.h>
 #include <cutils/properties.h>
 #include "audio_extn.h"
 #include <linux/msm_audio_calibration.h>
diff --git a/hal/audio_hw_extn_api.c b/hal/audio_hw_extn_api.c
index 4fece7e..84b413d 100644
--- a/hal/audio_hw_extn_api.c
+++ b/hal/audio_hw_extn_api.c
@@ -35,6 +35,7 @@
 #include <errno.h>
 #include <log/log.h>
 #include <cutils/atomic.h>
+#include <pthread.h>
 
 #include <hardware/audio.h>
 #include "sound/compress_params.h"