diff --git a/src/pyutil/apiutil.py b/src/pyutil/apiutil.py
index 66ee425a0714ff1ed4c0b8142b4789bdc3d4d331..7845c0e3f5b7a966e55f07f9afbfd9127395b96a 100644
--- a/src/pyutil/apiutil.py
+++ b/src/pyutil/apiutil.py
@@ -115,7 +115,7 @@ def do_tst_command(jobj, root_uuid=str(uuid.uuid4()), ns="/op0"):
     if len(jobj["children"]) != 1:
         print("ERROR: Not a simple TST")
     tstobj = jobj
-    tstobj["common_params"]["execunit"] = "/op0"
+    tstobj["common_params"]["execunit"] = ns
     tstobj["common_params"]["node-uuid"] = root_uuid
     cleanup_tst(tstobj)
     termobj = tstobj["children"][0]