diff --git a/application/palemoon/app/nsBrowserApp.cpp b/application/palemoon/app/nsBrowserApp.cpp
index 12db297f33..028113d0c7 100644
--- a/application/palemoon/app/nsBrowserApp.cpp
+++ b/application/palemoon/app/nsBrowserApp.cpp
@@ -36,6 +36,7 @@
 
 #include "nsXPCOMPrivate.h" // for MAXPATHLEN and XPCOM_DLL
 
+#include "mozilla/StartupTimeline.h"
 #include "mozilla/Sprintf.h"
 #include "mozilla/WindowsDllBlocklist.h"