diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index 887a702..ee982e5 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -1715,7 +1715,8 @@ retry_open:
 			exit(1);
 		}
 		if (fs->super->s_feature_incompat &
-		    EXT4_FEATURE_INCOMPAT_FLEX_BG) {
+		    EXT4_FEATURE_INCOMPAT_FLEX_BG &&
+		    fs->super->s_log_groups_per_flex) {
 			fputs(_("Changing the inode size not supported for "
 				"filesystems with the flex_bg\n"
 				"feature enabled.\n"),