diff --git a/aegisub/Makefile.am b/aegisub/Makefile.am
index f3c75c438e733dd8d0f725a7e836d9e6f2161ece..a447c288147d1517cf2cf493b8918118ca2820a0 100644
--- a/aegisub/Makefile.am
+++ b/aegisub/Makefile.am
@@ -295,4 +295,6 @@ noinst_HEADERS = \
 	mythes.hxx \
 	auto4_perldata.inc
 
-EXTRA_DIST = $(srcdir)/*.h beautify
+EXTRA_DIST = \
+	$(srcdir)/*.h \
+	$(srcdir)/include/aegisub/*.h