diff --git a/src/tests/system/libroot/posix/signal_test.cpp b/src/tests/system/libroot/posix/signal_test.cpp
index 809bb94020..8b095f60b3 100644
--- a/src/tests/system/libroot/posix/signal_test.cpp
+++ b/src/tests/system/libroot/posix/signal_test.cpp
@@ -7,6 +7,7 @@
 #include <errno.h>
 #include <signal.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>