diff --git a/simgear/hla/RTIFederateFactoryRegistry.cxx b/simgear/hla/RTIFederateFactoryRegistry.cxx
index d70e89d2..8cff8f25 100644
--- a/simgear/hla/RTIFederateFactoryRegistry.cxx
+++ b/simgear/hla/RTIFederateFactoryRegistry.cxx
@@ -25,7 +25,7 @@
 
 #include "RTIFederateFactoryRegistry.hxx"
 
-#include "simgear/threads/std::lock_guard.hxx"
+#include "simgear/threads/SGThread.hxx"
 #include "RTIFederate.hxx"
 
 namespace simgear {