diff --git a/src/tests/system/libroot/posix/mbtest.c b/src/tests/system/libroot/posix/mbtest.c
index 1996fec531..7b362aa690 100755
--- a/src/tests/system/libroot/posix/mbtest.c
+++ b/src/tests/system/libroot/posix/mbtest.c
@@ -1,12 +1,13 @@
 #include <locale.h>
 #include <limits.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 int main(int argc, char** argv) {
-	
+
 	setlocale(LC_CTYPE, "");
-	
+
 	printf("Len: %i\n", mblen(argv[1], SSIZE_MAX));
-	
+
 	return 0;
 }