diff --git a/sys/ia64/include/frame.h b/sys/ia64/include/frame.h
index 262a8bfd6457..683d16446429 100644
--- a/sys/ia64/include/frame.h
+++ b/sys/ia64/include/frame.h
@@ -29,7 +29,9 @@
 #ifndef _MACHINE_FRAME_H_
 #define	_MACHINE_FRAME_H_
 
+#ifndef _MACHINE_REGSET_H_
 #include <machine/_regset.h>
+#endif
 
 /*
  * Software trap, exception, and syscall frame.
diff --git a/sys/ia64/include/pcb.h b/sys/ia64/include/pcb.h
index 5d250bfeefdc..59334bfa5d82 100644
--- a/sys/ia64/include/pcb.h
+++ b/sys/ia64/include/pcb.h
@@ -30,7 +30,9 @@
 #ifndef _MACHINE_PCB_H_
 #define _MACHINE_PCB_H_
 
+#ifndef _MACHINE_REGSET_H_
 #include <machine/_regset.h>
+#endif
 
 /*
  * PCB: process control block