diff --git a/testfuncs.py b/testfuncs.py
index 571d219..4eda72a 100644
--- a/testfuncs.py
+++ b/testfuncs.py
@@ -507,6 +507,8 @@ def test_jira_fixes():
 def do_tests():
     # Test our own test function for NaNs
     test('reallyequal(NaN, Indet, 0.0)', False)
+    test('reallyequal(NaN, float("nan"), 0.0)', True)
+    test('reallyequal(-float("nan"), Indet, 0.0)', True)
 
     shouldexcept('div(1.0, 0.0)', ELSLMathError)
     shouldexcept('div(1, 0)', ELSLMathError)