diff --git a/src/cf/linux-test4.m4 b/src/cf/linux-test4.m4
index 5eabaa90b7..89fccf55e0 100644
--- a/src/cf/linux-test4.m4
+++ b/src/cf/linux-test4.m4
@@ -734,10 +734,7 @@ AC_DEFUN([LINUX_STATFS_TAKES_DENTRY], [
     AC_TRY_KBUILD(
 [#include <linux/fs.h>
 #include <linux/statfs.h>],
-[struct super_block _sb;
-struct dentry _dentry;
-struct kstatfs _kstatfs;
-(void)_sb.s_op->statfs(&_dentry, &_kstatfs);],
+[extern int simple_statfs(struct dentry *, struct kstatfs *);],
       ac_cv_linux_statfs_takes_dentry=yes,
       ac_cv_linux_statfs_takes_dentry=no)])
   AC_MSG_RESULT($ac_cv_linux_statfs_takes_dentry)])