diff --git a/src/meas_lat.c b/src/meas_lat.c
index 38a0d5c..cf1d2d4 100644
--- a/src/meas_lat.c
+++ b/src/meas_lat.c
@@ -202,6 +202,7 @@ void register_timer(struct evt_core_ctx* evts, int udp, int interval, int count,
 }
 
 int main(int argc, char** argv) {
+  setvbuf(stdout, NULL, _IONBF, 0);
   printf("~ measlat ~\n");
 
   int opt, udp_fd, count = 0, size = 0, interval = 0;
diff --git a/src/udp_echo.c b/src/udp_echo.c
index beb3c2f..3fd6256 100644
--- a/src/udp_echo.c
+++ b/src/udp_echo.c
@@ -30,6 +30,7 @@ int on_udp(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo) {
 }
 
 int main(int argc, char** argv) {
+  setvbuf(stdout, NULL, _IONBF, 0);
   printf("~ udpecho ~\n");
 
   int opt, udp_sock, verbose = 0;