diff --git a/Userland/Libraries/LibTextCodec/Decoder.cpp b/Userland/Libraries/LibTextCodec/Decoder.cpp
index c1cbb1d036..26fced6524 100644
--- a/Userland/Libraries/LibTextCodec/Decoder.cpp
+++ b/Userland/Libraries/LibTextCodec/Decoder.cpp
@@ -87,8 +87,8 @@ String get_standardized_encoding(const String& encoding)
 
     if (trimmed_lowercase_encoding.is_one_of("unicode-1-1-utf-8", "unicode11utf8", "unicode20utf8", "utf-8", "utf8", "x-unicode20utf8"))
         return "UTF-8";
-    if (trimmed_lowercase_encoding.is_one_of("866", "cp866", "csibm866", "ibm666"))
-        return "IBM666";
+    if (trimmed_lowercase_encoding.is_one_of("866", "cp866", "csibm866", "ibm866"))
+        return "IBM866";
     if (trimmed_lowercase_encoding.is_one_of("csisolatin2", "iso-8859-2", "iso-ir-101", "iso8859-2", "iso88592", "iso_8859-2", "iso_8859-2:1987", "l2", "latin2"))
         return "ISO-8859-2";
     if (trimmed_lowercase_encoding.is_one_of("csisolatin3", "iso-8859-3", "iso-ir-109", "iso8859-3", "iso88593", "iso_8859-3", "iso_8859-3:1988", "l3", "latin3"))