diff --git a/src/apps/activitymonitor/SettingsWindow.cpp b/src/apps/activitymonitor/SettingsWindow.cpp
index 816e9f0ff0..a7670d3001 100644
--- a/src/apps/activitymonitor/SettingsWindow.cpp
+++ b/src/apps/activitymonitor/SettingsWindow.cpp
@@ -6,6 +6,7 @@
 
 #include "SettingsWindow.h"
 
+#include <math.h>
 #include <stdio.h>
 
 #include <GridLayoutBuilder.h>