diff --git a/src/z3c/rml/rml2pdfscript.py b/src/z3c/rml/rml2pdfscript.py
index 5a037f5..dc94629 100644
--- a/src/z3c/rml/rml2pdfscript.py
+++ b/src/z3c/rml/rml2pdfscript.py
@@ -40,7 +40,6 @@ def testOpen(img, filename):
             # cleanup win paths like:
             # ....\\input\\file:///D:\\trunk\\...
             if sys.platform[:3].lower() == "win":
-                filename = filename.replace('/', '\\')
                 if filename.startswith('file:///'):
                     filename = filename[len('file:///'):]
             path = os.path.join(os.path.dirname(xmlInputName), filename)
diff --git a/src/z3c/rml/tests/test_rml.py b/src/z3c/rml/tests/test_rml.py
index 1a6d9ab..7c81ccb 100644
--- a/src/z3c/rml/tests/test_rml.py
+++ b/src/z3c/rml/tests/test_rml.py
@@ -44,7 +44,6 @@ def testOpen(img, filename):
             # cleanup win paths like:
             # ....\\input\\file:///D:\\trunk\\...
             if sys.platform[:3].lower() == "win":
-                filename.replace('/', '\\')
                 if filename.startswith('file:///'):
                     filename = filename[len('file:///'):]
             path = os.path.join(os.path.dirname(self._inPath), filename)