diff --git a/m4.include/mc-vfs.m4 b/m4.include/mc-vfs.m4
index 1e1a0777c..7d7325958 100644
--- a/m4.include/mc-vfs.m4
+++ b/m4.include/mc-vfs.m4
@@ -32,7 +32,9 @@ AC_DEFUN([MC_ENABLE_VFS_NET],
     dnl FIXME: network checks should probably be in their own macro.
     AC_REQUIRE_SOCKET
     if test x"$have_socket" = xyes; then
-	AC_CHECK_TYPE(nlink_t, unsigned int)
+        AC_CHECK_TYPE([nlink_t], ,
+                        [AC_DEFINE_UNQUOTED([nlink_t], [unsigned int],
+                            [Define to `unsigned int' if <sys/types.h> does not define.])])
 	AC_CHECK_TYPES([socklen_t],,,
 	    [
 #include <sys/types.h>
diff --git a/m4.include/vfs/mc-vfs-undelfs.m4 b/m4.include/vfs/mc-vfs-undelfs.m4
index a65d20d05..43f12ee90 100644
--- a/m4.include/vfs/mc-vfs-undelfs.m4
+++ b/m4.include/vfs/mc-vfs-undelfs.m4
@@ -22,8 +22,8 @@ AC_DEFUN([MC_UNDELFS_CHECKS], [
     if test x"$ext2fs_ext2fs_h" = xyes; then
       ext2fs_undel=yes
       EXT2FS_UNDEL_LIBS="-lext2fs -lcom_err"
-      AC_CHECK_TYPE(ext2_ino_t, ,
-		    [AC_DEFINE(ext2_ino_t, ino_t,
+      AC_CHECK_TYPE([ext2_ino_t], ,
+		    [AC_DEFINE_UNQUOTED([ext2_ino_t], [ino_t],
 			       [Define to ino_t if undefined.])],
 		    [
 #include <errno.h>