diff --git a/src/sim/fault_fwd.hh b/src/sim/fault_fwd.hh
index 26a133328..998dba195 100644
--- a/src/sim/fault_fwd.hh
+++ b/src/sim/fault_fwd.hh
@@ -28,8 +28,8 @@
  * Authors: Gabe Black
  */
 
-#ifndef __SIM_FAULT_HH__
-#define __SIM_FAULT_HH__
+#ifndef __SIM_FAULT_FWD_HH__
+#define __SIM_FAULT_FWD_HH__
 
 class FaultBase;
 template <class T> class RefCountingPtr;
@@ -37,4 +37,4 @@ typedef RefCountingPtr<FaultBase> Fault;
 
 FaultBase * const NoFault = 0;
 
-#endif // __SIM_FAULT_HH__
+#endif // __SIM_FAULT_FWD_HH__