diff --git a/dap-sdk/core/src/dap_common.c b/dap-sdk/core/src/dap_common.c
index d3104ded6ec8f32d597a85ec3a2efb7e47b21ab1..be8d1ccf87ac487333c838eaad43db5fdd57e69c 100755
--- a/dap-sdk/core/src/dap_common.c
+++ b/dap-sdk/core/src/dap_common.c
@@ -21,6 +21,7 @@
     You should have received a copy of the GNU General Public License
     along with any DAP based project.  If not, see <http://www.gnu.org/licenses/>.
 */
+#define _POSIX_THREAD_SAFE_FUNCTIONS
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h> /* 'nanosleep' */