diff --git a/tests/test_ui_mpldrawer.py b/tests/test_ui_mpldrawer.py
index 7833162c93..77c9a20f07 100644
--- a/tests/test_ui_mpldrawer.py
+++ b/tests/test_ui_mpldrawer.py
@@ -282,7 +282,7 @@ def test_render_label_empty():
 
 def test_render_label_not_empty():
     inits = {"q_0": r"\psi"}
-    _render_label("q_0", inits) != ""
+    assert _render_label("q_0", inits) != ""
 
 
 def test_cluster_gates():