diff --git a/apps/config.mk b/apps/config.mk
index 3668875b..51e9e219 100644
--- a/apps/config.mk
+++ b/apps/config.mk
@@ -30,7 +30,7 @@
 include $(LITEOSTOPDIR)/config.mk
 
 # common flags config
-BASE_OPTS := -D_FORTIFY_SOURCE=2 -D_GNU_SOURCE
+BASE_OPTS := -D_FORTIFY_SOURCE=2 -D_XOPEN_SOURCE=700
 
 ASFLAGS   :=
 CFLAGS    := $(LITEOS_COPTS) $(BASE_OPTS) -fPIE
diff --git a/apps/shell/builtin/cd.c b/apps/shell/builtin/cd.c
index 9992f45f..f1e11949 100644
--- a/apps/shell/builtin/cd.c
+++ b/apps/shell/builtin/cd.c
@@ -29,9 +29,7 @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef  _GNU_SOURCE
 #define _GNU_SOURCE
-#endif
 
 #include "unistd.h"
 #include "shcmd.h"
diff --git a/apps/shell/src/main.c b/apps/shell/src/main.c
index 8401c0ca..0d08fa5e 100644
--- a/apps/shell/src/main.c
+++ b/apps/shell/src/main.c
@@ -29,6 +29,8 @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#define _GNU_SOURCE
+
 #include "show.h"
 #include "shmsg.h"
 #include "shcmd.h"
diff --git a/apps/shell/src/shmsg.c b/apps/shell/src/shmsg.c
index b4f237ba..795951d1 100644
--- a/apps/shell/src/shmsg.c
+++ b/apps/shell/src/shmsg.c
@@ -29,6 +29,8 @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#define _GNU_SOURCE
+
 #include "stdlib.h"
 #include "stdio.h"
 #include "unistd.h"