diff --git a/components/libc/pthreads/pthread.h b/components/libc/pthreads/pthread.h
index 7481595682236a799668d6ebb817a59eff2d4236..2674599aacc617ee8a6b3752b8494cd4898d1967 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 a3dad27989ea6ba01bd663068a2055bcf334705e..403db780992c69e226b35bc1974590f1c00f5c59 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 832bd7502a1f71e5ed302a8b6bb9d2bda1cb6805..487c005b654a384e553a559a858e23f4d30e5a89 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);