diff --git a/doc/Makefile b/doc/Makefile
index b94e391e0dbd160de7fff96ffa9175a1b8c126f3..f02e290ba41520b6687aa46cd6f165885ee7e017 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -2,5 +2,6 @@ TOP=..
 include $(TOP)/mk/boilerplate.mk
 
 SGML_DOC = haddock
+INSTALL_SGML_DOC = haddock
 
 include $(TOP)/mk/target.mk