diff --git a/tests/test_domain_cpp.py b/tests/test_domain_cpp.py
index 0fe8d5c19..b8856824b 100644
--- a/tests/test_domain_cpp.py
+++ b/tests/test_domain_cpp.py
@@ -10,6 +10,7 @@
 """
 
 import re
+import sys
 
 import pytest
 from six import text_type
@@ -137,8 +138,9 @@ def test_expressions():
         exprCheck(p + "'\\x0A'", t + "10")
         exprCheck(p + "'\\u0a42'", t + "2626")
         exprCheck(p + "'\\u0A42'", t + "2626")
-        exprCheck(p + "'\\U0001f34c'", t + "127820")
-        exprCheck(p + "'\\U0001F34C'", t + "127820")
+        if sys.maxunicode > 65535:
+            exprCheck(p + "'\\U0001f34c'", t + "127820")
+            exprCheck(p + "'\\U0001F34C'", t + "127820")
 
     # TODO: user-defined lit
     exprCheck('(... + Ns)', '(... + Ns)')