diff --git a/configure.ac b/configure.ac
index 46b3b0c..67994eb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -130,7 +130,6 @@ src/cthulhu/plugins/SelfVoice/Makefile
 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