diff --git a/plugins/Makefile.am b/plugins/Makefile.am
index 0a720b2d..2310f107 100644
--- a/plugins/Makefile.am
+++ b/plugins/Makefile.am
@@ -46,7 +46,7 @@ SUBDIRS = picohttpparser
 
 np_test_scripts = tests/test_check_swap.t
 
-EXTRA_DIST = t tests $(np_test_scripts)
+EXTRA_DIST = t tests $(np_test_scripts) check_swap.d
 
 PLUGINHDRS = common.h