diff --git a/src/apps/diskusage/Common.cpp b/src/apps/diskusage/Common.cpp
index 25ede95817..17d4b2ad44 100644
--- a/src/apps/diskusage/Common.cpp
+++ b/src/apps/diskusage/Common.cpp
@@ -11,6 +11,7 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include <Application.h>
 #include <FindDirectory.h>