--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -2,7 +2,7 @@ libincludedir = ${libdir}/@PACKAGE@/incl
 
 lib_LTLIBRARIES = libzip.la
 noinst_HEADERS = zipint.h
-include_HEADERS = zip.h
+include_HEADERS = zip.h zipconf.h
 libinclude_HEADERS = zipconf.h
 
 # also update CMakeLists.txt when changing version