diff --git a/Userland/Libraries/LibTextCodec/Decoder.cpp b/Userland/Libraries/LibTextCodec/Decoder.cpp
index 4e83cc779a..cde353068a 100644
--- a/Userland/Libraries/LibTextCodec/Decoder.cpp
+++ b/Userland/Libraries/LibTextCodec/Decoder.cpp
@@ -192,12 +192,6 @@ Optional<String> get_standardized_encoding(const String& encoding)
     return {};
 }
 
-bool is_standardized_encoding(const String& encoding)
-{
-    auto standardized_encoding = get_standardized_encoding(encoding);
-    return standardized_encoding.has_value() && encoding.equals_ignoring_case(standardized_encoding.value());
-}
-
 String UTF8Decoder::to_utf8(const StringView& input)
 {
     return input;
diff --git a/Userland/Libraries/LibTextCodec/Decoder.h b/Userland/Libraries/LibTextCodec/Decoder.h
index 871ef35d9a..73ad85d4ea 100644
--- a/Userland/Libraries/LibTextCodec/Decoder.h
+++ b/Userland/Libraries/LibTextCodec/Decoder.h
@@ -60,6 +60,5 @@ public:
 
 Decoder* decoder_for(const String& encoding);
 Optional<String> get_standardized_encoding(const String& encoding);
-bool is_standardized_encoding(const String& encoding);
 
 }