diff --git a/src/xenia/base/clock.h b/src/xenia/base/clock.h
index f1bf6d31c..fba845c92 100644
--- a/src/xenia/base/clock.h
+++ b/src/xenia/base/clock.h
@@ -23,7 +23,7 @@ class Clock {
   // Host time, in FILETIME format.
   static uint64_t QueryHostSystemTime();
   // Queries the milliseconds since the host began.
-  static uint32_t QueryHostUptimeMillis();
+  static uint64_t QueryHostUptimeMillis();
 
   // Guest time scalar.
   static double guest_time_scalar();
diff --git a/src/xenia/base/clock_posix.cc b/src/xenia/base/clock_posix.cc
index 6fb2f652a..e2f1cf627 100644
--- a/src/xenia/base/clock_posix.cc
+++ b/src/xenia/base/clock_posix.cc
@@ -39,8 +39,8 @@ uint64_t Clock::QueryHostSystemTime() {
   return ret;
 }
 
-uint32_t Clock::QueryHostUptimeMillis() {
-  return uint32_t(QueryHostTickCount() / (host_tick_frequency() / 1000));
+uint64_t Clock::QueryHostUptimeMillis() {
+  return QueryHostTickCount() / (host_tick_frequency() / 1000);
 }
 
 }  // namespace xe
\ No newline at end of file
diff --git a/src/xenia/base/clock_win.cc b/src/xenia/base/clock_win.cc
index faead286c..aa028c43b 100644
--- a/src/xenia/base/clock_win.cc
+++ b/src/xenia/base/clock_win.cc
@@ -36,8 +36,8 @@ uint64_t Clock::QueryHostSystemTime() {
   return (uint64_t(t.dwHighDateTime) << 32) | t.dwLowDateTime;
 }
 
-uint32_t Clock::QueryHostUptimeMillis() {
-  return uint32_t(QueryHostTickCount() / (host_tick_frequency() / 1000));
+uint64_t Clock::QueryHostUptimeMillis() {
+  return QueryHostTickCount() / (host_tick_frequency() / 1000);
 }
 
 }  // namespace xe