diff --git a/aegisub/src/Makefile.am b/aegisub/src/Makefile.am
index d6892d485..58cee4ae6 100644
--- a/aegisub/src/Makefile.am
+++ b/aegisub/src/Makefile.am
@@ -13,7 +13,7 @@ SUBDIRS = \
 	libresrc \
 	$(libosxutil_subdir)
 
-AM_CXXFLAGS = -DAEGISUB -Iinclude @WX_CPPFLAGS@ @OPENMP_CXXFLAGS@ @LIBAVFORMAT_CFLAGS@ @LIBAVCODEC_CFLAGS@ @LIBSWSCALE_CFLAGS@ @LIBAVUTIL_CFLAGS@ -I../libffms/include
+AM_CXXFLAGS = -DAEGISUB -Iinclude -I../libffms/include @WX_CPPFLAGS@ @OPENMP_CXXFLAGS@ @LIBAVFORMAT_CFLAGS@ @LIBAVCODEC_CFLAGS@ @LIBSWSCALE_CFLAGS@ @LIBAVUTIL_CFLAGS@
 
 bin_PROGRAMS = aegisub-2.2
 aegisub_2_2_LDADD = libresrc/libresrc.a $(libosxutil_lib)