diff --git a/testing/drivertest/drivertest_oneshot.c b/testing/drivertest/drivertest_oneshot.c
index 5971bb93c..85af74ec2 100644
--- a/testing/drivertest/drivertest_oneshot.c
+++ b/testing/drivertest/drivertest_oneshot.c
@@ -26,6 +26,7 @@
 #include <stdio.h>
 #include <signal.h>
 #include <time.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include <setjmp.h>
 #include <cmocka.h>
diff --git a/testing/drivertest/drivertest_posix_timer.c b/testing/drivertest/drivertest_posix_timer.c
index c042acda6..dbe9eca59 100644
--- a/testing/drivertest/drivertest_posix_timer.c
+++ b/testing/drivertest/drivertest_posix_timer.c
@@ -25,6 +25,7 @@
 #include <stdio.h>
 #include <signal.h>
 #include <setjmp.h>
+#include <stdlib.h>
 #include <cmocka.h>
 #include <syslog.h>
 #include <nuttx/timers/timer.h>