diff --git a/tests/testcases/common.py b/tests/testcases/common.py
index cef5ac3..15d9cbe 100644
--- a/tests/testcases/common.py
+++ b/tests/testcases/common.py
@@ -5,7 +5,12 @@ import random
 import string
 def set_window_name(conn, wid, name):
     prop_name = "_NET_WM_NAME"
-    prop_name = conn.core.InternAtom(True, len(prop_name), prop_name).reply().atom
+    prop_name = conn.core.InternAtom(False, len(prop_name), prop_name).reply().atom
+    str_type = "UTF8_STRING"
+    str_type = conn.core.InternAtom(True, len(str_type), str_type).reply().atom
+    conn.core.ChangePropertyChecked(xproto.PropMode.Replace, wid, prop_name, str_type, 8, len(name), name).check()
+    prop_name = "WM_NAME"
+    prop_name = conn.core.InternAtom(False, len(prop_name), prop_name).reply().atom
     str_type = "STRING"
     str_type = conn.core.InternAtom(True, len(str_type), str_type).reply().atom
     conn.core.ChangePropertyChecked(xproto.PropMode.Replace, wid, prop_name, str_type, 8, len(name), name).check()