diff --git a/ftfy/badness.py b/ftfy/badness.py
index 38ec1f4..813ef89 100644
--- a/ftfy/badness.py
+++ b/ftfy/badness.py
@@ -301,7 +301,7 @@
     |
     [{box}] [{kaomoji}]
     |
-    [{lower_accented}{upper_accented}{currency}{numeric}{start_punctuation}{end_punctuation}{law}] [{box}]
+    [{lower_accented}{upper_accented}{lower_common}{upper_common}{currency}{numeric}{start_punctuation}{end_punctuation}{law}] [{box}]
     |
     [{box}] [{end_punctuation}]
     |
diff --git a/ftfy/chardata.py b/ftfy/chardata.py
index 43d117c..f5af37e 100644
--- a/ftfy/chardata.py
+++ b/ftfy/chardata.py
@@ -23,6 +23,7 @@
     "iso-8859-2",
     "macroman",
     "cp437",
+    "koi8-r",
 ]
 
 SINGLE_QUOTE_RE = re.compile("[\u02bc\u2018-\u201b]")
diff --git a/tests/test-cases/in-the-wild.json b/tests/test-cases/in-the-wild.json
index b40c838..c32b11e 100644
--- a/tests/test-cases/in-the-wild.json
+++ b/tests/test-cases/in-the-wild.json
@@ -447,5 +447,12 @@
         "fixed-encoding": "Ningbo，China",
         "fixed": "Ningbo,China",
         "expect": "pass"
+    },
+    {
+        "label": "Russian text in KOI8-R mojibake",
+        "comment": "issue #231. Reported as CP437/CP866, but it is KOI8-R: 0xD0 and 0xD1 decode to 'п' and 'я', which are the UTF-8 lead bytes of Cyrillic.",
+        "original": "п∙я│п╩п╦ п▓я▀ п╫п╣ я▐п╡п╩я▐п╣я┌п╣я│я▄ п╟п╢я─п╣я│п╟я┌п╬п╪",
+        "fixed": "Если Вы не являетесь адресатом",
+        "expect": "pass"
     }
 ]
\ No newline at end of file