diff --git a/src/apps/activitymonitor/SettingsWindow.cpp b/src/apps/activitymonitor/SettingsWindow.cpp
index a7670d3001..50406b436b 100644
--- a/src/apps/activitymonitor/SettingsWindow.cpp
+++ b/src/apps/activitymonitor/SettingsWindow.cpp
@@ -6,8 +6,8 @@
 
 #include "SettingsWindow.h"
 
-#include <math.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 #include <GridLayoutBuilder.h>
 #include <GroupLayoutBuilder.h>