diff --git a/meta/recipes-core/isar-bootstrap/isar-bootstrap.inc b/meta/recipes-core/isar-bootstrap/isar-bootstrap.inc
index b8af676..9f297ce 100644
--- a/meta/recipes-core/isar-bootstrap/isar-bootstrap.inc
+++ b/meta/recipes-core/isar-bootstrap/isar-bootstrap.inc
@@ -64,7 +64,7 @@ python () {
         d.appendVar("SRC_URI", " file://%s" % bb.parse.resolve_file(file, d))
 
     distro_apt_preferences = d.getVar(d.getVar("DISTRO_VARS_PREFIX") + "DISTRO_APT_PREFERENCES", True)
-    for file in distro_apt_sources.split():
+    for file in distro_apt_preferences.split():
         d.appendVar("SRC_URI", " file://%s" % bb.parse.resolve_file(file, d))
 }