diff --git a/m4/ul.m4 b/m4/ul.m4
index c0082d0be4..c3c8059c3b 100644
--- a/m4/ul.m4
+++ b/m4/ul.m4
@@ -217,6 +217,8 @@ AC_DEFUN([UL_CONFLICTS_BUILD], [
       [build_]suffix=no ;;
     check:yes)
       [build_]suffix=no ;;
+    check:no)
+      [build_]suffix=yes ;;
     yes:yes)
       AC_MSG_ERROR([$1 selected, but it conflicts with $3]);;
     esac