diff --git a/sim/ppc/configure.in b/sim/ppc/configure.in
index e3d2dc3511..7df389f4b1 100644
--- a/sim/ppc/configure.in
+++ b/sim/ppc/configure.in
@@ -420,7 +420,7 @@ AC_SUBST(CC_FOR_BUILD)
 AC_C_BIGENDIAN
 AC_SUBST(WORDS_BIGENDIAN)
 
-AC_CHECK_HEADERS(string.h strings.h stdlib.h time.h sys/types.h sys/time.h sys/times.h unistd.h sys/resource.h)
+AC_CHECK_HEADERS(string.h strings.h stdlib.h time.h sys/mount.h sys/types.h sys/time.h sys/times.h unistd.h sys/resource.h)
 AC_HEADER_DIRENT
 
 AC_OUTPUT(Makefile,