diff --git a/trunk/src/app/srs_app_utility.cpp b/trunk/src/app/srs_app_utility.cpp
index 2f8b1248e..14cb23de7 100644
--- a/trunk/src/app/srs_app_utility.cpp
+++ b/trunk/src/app/srs_app_utility.cpp
@@ -28,6 +28,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <ifaddrs.h>
 #include <arpa/inet.h>
 #include <signal.h>
+#include <wait.h>
 
 #ifdef SRS_OSX
 #include <sys/sysctl.h>