diff --git a/filesystem.mk b/filesystem.mk
index c704e538d..093aeddc5 100644
--- a/filesystem.mk
+++ b/filesystem.mk
@@ -3349,10 +3349,10 @@ files/demo/intro/intro.narc: \
 	files/demo/intro/intro/narc_0001.NCLR \
 	files/demo/intro/intro/narc_0002.NCLR \
 	files/demo/intro/intro/narc_0008.NCGR \
-    files/demo/intro/intro/narc_0009.NCGR \
-    files/demo/intro/intro/narc_0010.NCGR \
-    files/demo/intro/intro/narc_0011.NCGR \
-    files/demo/intro/intro/narc_0012.NCLR
+	files/demo/intro/intro/narc_0009.NCGR \
+	files/demo/intro/intro/narc_0010.NCGR \
+	files/demo/intro/intro/narc_0011.NCGR \
+	files/demo/intro/intro/narc_0012.NCLR
 
 files/graphic/field_board.narc: \
 	files/graphic/field_board/narc_0000.NCGR \