diff --git a/src/pathfinder/pf_performance_timer.hpp b/src/pathfinder/pf_performance_timer.hpp
--- a/src/pathfinder/pf_performance_timer.hpp
+++ b/src/pathfinder/pf_performance_timer.hpp
@@ -12,7 +12,7 @@
 #ifndef PF_PERFORMANCE_TIMER_HPP
 #define PF_PERFORMANCE_TIMER_HPP
 
-extern uint64 ottd_rdtsc();
+#include "../debug.h"
 
 struct CPerformanceTimer
 {