diff --git a/configure.ac b/configure.ac
index 1a1e7b201ed35d4f2bcdb249b97af7731835d813..014ada0d54cec101238a315e944a97b2f4487930 100644
--- a/configure.ac
+++ b/configure.ac
@@ -205,7 +205,6 @@ AC_CONFIG_FILES([
    direct/Makefile
    cdirect/Makefile
    stogo/Makefile
-   subplex/Makefile
    praxis/Makefile
    lbfgs/Makefile
    luksan/Makefile