diff --git a/src/isodate/build.app b/src/isodate/build.app
index b4eb742..3e4223b 100644
--- a/src/isodate/build.app
+++ b/src/isodate/build.app
@@ -3,6 +3,8 @@
 #  isodate_BUILT
 #
 
+build_target libiso8601
+
 if [ -z ${isodate_BUILT} ]
 then
     isodate="obj/isodate"
diff --git a/src/setisodate/build.app b/src/setisodate/build.app
index 77e4889..af8d0f8 100644
--- a/src/setisodate/build.app
+++ b/src/setisodate/build.app
@@ -3,6 +3,8 @@
 #  setisodate_BUILT
 #
 
+build_target libiso8601
+
 if [ -z ${setisodate_BUILT} ]
 then
     setisodate="obj/setisodate"