diff --git a/docs/reference/lasso/Makefile.am b/docs/reference/lasso/Makefile.am
index d536517a..ac8c5118 100644
--- a/docs/reference/lasso/Makefile.am
+++ b/docs/reference/lasso/Makefile.am
@@ -95,7 +95,7 @@ include $(top_srcdir)/gtk-doc.make
 
 # Other files to distribute
 # e.g. EXTRA_DIST += version.xml.in
-EXTRA_DIST = lasso-sections.txt lasso-docs.sgml version.xml.in lasso.types.in style.css
+EXTRA_DIST += lasso-sections.txt lasso-docs.sgml version.xml.in lasso.types.in style.css
 
 # Files not to distribute
 # for --rebuild-types in $(SCAN_OPTIONS), e.g. $(DOC_MODULE).types