diff --git a/Makefile.am b/Makefile.am
index e34f13e9..1aeb5ddb 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -168,7 +168,7 @@ dist_example_DATA = example.c
 
 EXTRA_DIST = win release $(DOCS) testimages CMakeLists.txt \
 	sharedlib/CMakeLists.txt cmakescripts libjpeg.map.in doc doxygen.config \
-	jccolext.c jdcolext.c jdcol565.c jdmrgext.c jstdhuff.c
+	doxygen-extra.css jccolext.c jdcolext.c jdcol565.c jdmrgext.c jstdhuff.c
 
 dist-hook:
 	rm -rf `find $(distdir) -name .svn`