diff --git a/IPython/core/tests/test_oinspect.py b/IPython/core/tests/test_oinspect.py
index f4f6e1a..930ee35 100644
--- a/IPython/core/tests/test_oinspect.py
+++ b/IPython/core/tests/test_oinspect.py
@@ -54,7 +54,7 @@ def test_find_source_lines():
 # A couple of utilities to ensure these tests work the same from a source or a
 # binary install
 def pyfile(fname):
-    return re.sub('.py[co]$', '.py', fname)
+    return os.path.normcase(re.sub('.py[co]$', '.py', fname))
 
 
 def match_pyfiles(f1, f2):