diff --git a/indra/newview/statemachine/aistatemachine.cpp b/indra/newview/statemachine/aistatemachine.cpp
index a6a646ec9..d6b7c620f 100644
--- a/indra/newview/statemachine/aistatemachine.cpp
+++ b/indra/newview/statemachine/aistatemachine.cpp
@@ -38,8 +38,6 @@
 #include "aithreadsafe.h"
 #include "aistatemachine.h"
 
-extern F64 calc_clock_frequency(void);
-
 extern LLControlGroup gSavedSettings;
 
 // Local variables.