diff --git a/Makefile.am b/Makefile.am
index 62f1afda..000f31b6 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -4,6 +4,9 @@
 SUBDIRS = include src converters tools python
 DIST_SUBDIRS = $(SUBDIRS)
 
+EXTRA_DIST = LICENSE LICENSE.images LICENSE.mesa LICENSE.pngsuite \
+	LICENSE.pnmcolormap LICENSE.sdump LICENSE.sixel LICENSE.stb
+
 ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
 
 srcdir = @srcdir@
diff --git a/Makefile.in b/Makefile.in
index bdcdf4af..e034aab5 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -392,6 +392,9 @@ zshcompletiondir = @zshcompletiondir@
 #
 SUBDIRS = include src converters tools python
 DIST_SUBDIRS = $(SUBDIRS)
+EXTRA_DIST = LICENSE LICENSE.images LICENSE.mesa LICENSE.pngsuite \
+	LICENSE.pnmcolormap LICENSE.sdump LICENSE.sixel LICENSE.stb
+
 ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
 pkgconfig_DATA = $(builddir)/libsixel.pc
 CLEANFILES = $(builddir)/valgrind.log $(builddir)/test.log $(builddir)/unittest.log