diff --git a/components/libc/pthreads/pthread.h b/components/libc/pthreads/pthread.h
index 7481595682..2674599aac 100644
--- a/components/libc/pthreads/pthread.h
+++ b/components/libc/pthreads/pthread.h
@@ -87,7 +87,7 @@ enum
 struct pthread_attr
 {
     void*       stack_base;
-    rt_uint16_t stack_size;     /* stack size of thread */
+    rt_uint32_t stack_size;     /* stack size of thread */
 
     rt_uint8_t priority;        /* priority of thread */
     rt_uint8_t detachstate;     /* detach state */
diff --git a/include/rtdef.h b/include/rtdef.h
index a3dad27989..403db78099 100644
--- a/include/rtdef.h
+++ b/include/rtdef.h
@@ -496,7 +496,7 @@ struct rt_thread
     void       *entry;                                  /**< entry */
     void       *parameter;                              /**< parameter */
     void       *stack_addr;                             /**< stack address */
-    rt_uint16_t stack_size;                             /**< stack size */
+    rt_uint32_t stack_size;                             /**< stack size */
 
     /* error code */
     rt_err_t    error;                                  /**< error code */
diff --git a/src/thread.c b/src/thread.c
index 832bd7502a..487c005b65 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -98,7 +98,7 @@ static rt_err_t _rt_thread_init(struct rt_thread *thread,
 
     /* stack init */
     thread->stack_addr = stack_start;
-    thread->stack_size = (rt_uint16_t)stack_size;
+    thread->stack_size = stack_size;
 
     /* init thread stack */
     rt_memset(thread->stack_addr, '#', thread->stack_size);