diff --git a/pelican/readers.py b/pelican/readers.py
index a581e458..632c72b9 100644
--- a/pelican/readers.py
+++ b/pelican/readers.py
@@ -36,8 +36,8 @@ class Reader(object):
         self.settings = settings
 
     def process_metadata(self, name, value):
-        if name.lower() in _METADATA_PROCESSORS:
-            return _METADATA_PROCESSORS[name.lower()](value, self.settings)
+        if name in _METADATA_PROCESSORS:
+            return _METADATA_PROCESSORS[name](value, self.settings)
         return value
 
 
@@ -75,6 +75,7 @@ class RstReader(Reader):
                 else:  # standard fields (e.g. address)
                     name = element.tagname
                     value = element.astext()
+                name = name.lower()
 
                 output[name] = self.process_metadata(name, value)
         return output
diff --git a/tests/content/article_with_uppercase_metadata.rst b/tests/content/article_with_uppercase_metadata.rst
new file mode 100644
index 00000000..e26cdd13
--- /dev/null
+++ b/tests/content/article_with_uppercase_metadata.rst
@@ -0,0 +1,6 @@
+
+This is a super article !
+#########################
+
+:Category: Yeah
+
diff --git a/tests/test_readers.py b/tests/test_readers.py
index c0b8cc41..058469d4 100644
--- a/tests/test_readers.py
+++ b/tests/test_readers.py
@@ -35,6 +35,14 @@ class RstReaderTest(unittest.TestCase):
         for key, value in expected.items():
             self.assertEquals(value, metadata[key], key)
 
+    def test_article_metadata_key_lowercase(self):
+        """Keys of metadata should be lowercase."""
+        reader = readers.RstReader({})
+        content, metadata = reader.read(_filename('article_with_uppercase_metadata.rst'))
+
+        self.assertIn('category', metadata, "Key should be lowercase.")
+        self.assertEquals('Yeah', metadata.get('category'), "Value keeps cases.")
+
     def test_typogrify(self):
         # if nothing is specified in the settings, the content should be
         # unmodified