diff --git a/configure.in b/configure.in
index 24b7ea6..84938af 100644
--- a/configure.in
+++ b/configure.in
@@ -83,7 +83,7 @@ AC_CHECK_LIB(kvm, kvm_open,[
 ])
 
 dnl NetBSD, OpenBSD and FreeBSD
-AC_CHECK_HEADERS(sched.h sys/sched.h machine/cpufunc.h sys/types.h machine/pio.h machine/sysarch.h)
+AC_CHECK_HEADERS(sched.h sys/sched.h machine/cpufunc.h sys/types.h machine/pio.h machine/sysarch.h sys/cpuvar.h)
 ETR_SYSV_IPC
 ETR_UNION_SEMUN