diff --git a/components/pthreads/mqueue.c b/components/pthreads/mqueue.c
index 8886988a1f..7b669dc367 100644
--- a/components/pthreads/mqueue.c
+++ b/components/pthreads/mqueue.c
@@ -21,6 +21,7 @@
  * Date           Author       Notes
  */
 
+#include <string.h>
 #include "mqueue.h"
 #include "pthread_internal.h"
 
diff --git a/components/pthreads/semaphore.c b/components/pthreads/semaphore.c
index a1bf42e899..ae69e0d1bc 100644
--- a/components/pthreads/semaphore.c
+++ b/components/pthreads/semaphore.c
@@ -23,6 +23,7 @@
  */
 
 #include <rtthread.h>
+#include <string.h>
 #include "semaphore.h"
 #include "pthread_internal.h"