diff --git a/configure.ac b/configure.ac
index 26f7ec6..1add108 100644
--- a/configure.ac
+++ b/configure.ac
@@ -130,6 +130,7 @@ src/cthulhu/plugins/Date/Makefile
 src/cthulhu/plugins/Time/Makefile
 src/cthulhu/plugins/MouseReview/Makefile
 src/cthulhu/plugins/ClassicPreferences/Makefile
+src/cthulhu/plugins/SimplePluginSystem/Makefile
 src/cthulhu/backends/Makefile
 src/cthulhu/cthulhu_bin.py
 src/cthulhu/cthulhu_i18n.py