diff --git a/configure.ac b/configure.ac
index dc13d86e..2ce4607c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -271,6 +271,7 @@ toys/Makefile
 toys/mug/Makefile
 toys/mug2/Makefile
 toys/muile/Makefile
+toys/procmule/Makefile
 man/Makefile
 m4/Makefile
 contrib/Makefile