diff --git a/test/bug.calc.t b/test/bug.calc.t
index 9c2ed36e8..d788734cb 100755
--- a/test/bug.calc.t
+++ b/test/bug.calc.t
@@ -34,7 +34,7 @@ my $output = qx{../src/calc --debug 15min};
 unlike ($output, qr/token infix '15' Date/,           'Misinterpretation: 15min -> 15');
 unlike ($output, qr/token infix 'min' Identifier/,    'Misinterpretation: 15min -> m');
 unlike ($output, qr/Error: Unexpected stack size: 2/, 'Unexpected stack size');
-like ($output, qr/\[1\] eval push '15min' Duration/,  '15min -> 15min Duration');
+like ($output, qr/\[1\] eval push 'PT15M' Duration/,  '15min -> PT15M Duration');
 like ($output, qr/PT15M/,                             '15min -> PT15m Duration');
 
 exit 0;