diff --git a/aegisub/Makefile.am b/aegisub/Makefile.am
index 3c1400d99..cf742be86 100644
--- a/aegisub/Makefile.am
+++ b/aegisub/Makefile.am
@@ -185,9 +185,11 @@ aegisub_SOURCES = \
 	subs_preview.cpp \
 	subtitle_format.cpp \
 	subtitle_format_ass.cpp \
+	subtitle_format_microdvd.cpp \
 	subtitle_format_mkv.cpp \
 	subtitle_format_srt.cpp \
 	subtitle_format_txt.cpp \
+	subtitle_format_ttxt.cpp \
 	subtitles_provider.cpp \
 	subtitles_provider_csri.cpp \
 	text_file_reader.cpp \