diff --git a/src/dom/document.zig b/src/dom/document.zig
index 22eac8d2..76d58158 100644
--- a/src/dom/document.zig
+++ b/src/dom/document.zig
@@ -54,10 +54,8 @@ pub const Document = struct {
         return "CSS1Compat";
     }
 
-    // TODO implement characterSet
     pub fn get_characterSet(self: *parser.Document) []const u8 {
-        _ = self;
-        return "UTF-8";
+        return parser.documentGetInputEncoding(self);
     }
 
     // alias of get_characterSet
diff --git a/src/netsurf.zig b/src/netsurf.zig
index 368e01f1..7afaafec 100644
--- a/src/netsurf.zig
+++ b/src/netsurf.zig
@@ -800,6 +800,12 @@ pub inline fn documentGetDocumentURI(doc: *Document) []const u8 {
     return stringToData(s.?);
 }
 
+pub inline fn documentGetInputEncoding(doc: *Document) []const u8 {
+    var s: ?*String = undefined;
+    _ = documentVtable(doc).dom_document_get_input_encoding.?(doc, &s);
+    return stringToData(s.?);
+}
+
 pub inline fn documentCreateElement(doc: *Document, tag_name: []const u8) *Element {
     var elem: ?*Element = undefined;
     _ = documentVtable(doc).dom_document_create_element.?(doc, stringFromData(tag_name), &elem);