diff --git a/test/data/base/19-op-join-with-vars.json b/test/data/base/19-op-join-with-vars.json
new file mode 100644
index 00000000..da873017
--- /dev/null
+++ b/test/data/base/19-op-join-with-vars.json
@@ -0,0 +1,4 @@
+{
+  "lang":"nl_NL.UTF-8",
+  "version": "2"
+}
diff --git a/test/data/base/19-op-join-with-vars.yaml b/test/data/base/19-op-join-with-vars.yaml
new file mode 100644
index 00000000..7fd5dcfa
--- /dev/null
+++ b/test/data/base/19-op-join-with-vars.yaml
@@ -0,0 +1,19 @@
+otk.version: 1
+
+otk.define:
+  default:
+    modifications:
+      language: en_US.UTF-8   
+  
+  user:
+    modifications:
+      language: nl_NL.UTF-8
+
+  modifications:
+    otk.op.join:
+      values:
+        - ${default.modifications}
+        - ${user.modifications}
+
+otk.target.osbuild:
+  lang: ${modifications.language}