diff --git a/mozglue/misc/TimeStamp.h b/mozglue/misc/TimeStamp.h
index 7e9fa4957701..a760af644aae 100644
--- a/mozglue/misc/TimeStamp.h
+++ b/mozglue/misc/TimeStamp.h
@@ -591,7 +591,6 @@ public:
 
 private:
   friend struct IPC::ParamTraits<mozilla::TimeStamp>;
-  friend void StartupTimelineRecordExternal(int, uint64_t);
 
   MOZ_IMPLICIT TimeStamp(TimeStampValue aValue) : mValue(aValue) {}
 
diff --git a/mozglue/misc/TimeStamp_windows.h b/mozglue/misc/TimeStamp_windows.h
index 3853d0627f1c..d629339f6689 100644
--- a/mozglue/misc/TimeStamp_windows.h
+++ b/mozglue/misc/TimeStamp_windows.h
@@ -17,7 +17,6 @@ class TimeStampValue
 {
   friend struct IPC::ParamTraits<mozilla::TimeStampValue>;
   friend class TimeStamp;
-  friend void StartupTimelineRecordExternal(int, uint64_t);
 
   // Both QPC and GTC are kept in [mt] units.
   uint64_t mGTC;