diff --git a/AK/StringBuilder.cpp b/AK/StringBuilder.cpp
index f69077c6ee..40a6e83646 100644
--- a/AK/StringBuilder.cpp
+++ b/AK/StringBuilder.cpp
@@ -113,29 +113,34 @@ void StringBuilder::clear()
     m_length = 0;
 }
 
+void StringBuilder::append_codepoint(u32 codepoint)
+{
+    if (codepoint <= 0x7f) {
+        append((char)codepoint);
+    } else if (codepoint <= 0x07ff) {
+        append((char)(((codepoint >> 6) & 0x1f) | 0xc0));
+        append((char)(((codepoint >> 0) & 0x3f) | 0x80));
+    } else if (codepoint <= 0xffff) {
+        append((char)(((codepoint >> 12) & 0x0f) | 0xe0));
+        append((char)(((codepoint >> 6) & 0x3f) | 0x80));
+        append((char)(((codepoint >> 0) & 0x3f) | 0x80));
+    } else if (codepoint <= 0x10ffff) {
+        append((char)(((codepoint >> 18) & 0x07) | 0xf0));
+        append((char)(((codepoint >> 12) & 0x3f) | 0x80));
+        append((char)(((codepoint >> 6) & 0x3f) | 0x80));
+        append((char)(((codepoint >> 0) & 0x3f) | 0x80));
+    } else {
+        append(0xef);
+        append(0xbf);
+        append(0xbd);
+    }
+}
+
 void StringBuilder::append(const Utf32View& utf32_view)
 {
     for (size_t i = 0; i < utf32_view.length(); ++i) {
         auto codepoint = utf32_view.codepoints()[i];
-        if (codepoint <= 0x7f) {
-            append((char)codepoint);
-        } else if (codepoint <= 0x07ff) {
-            append((char)(((codepoint >> 6) & 0x1f) | 0xc0));
-            append((char)(((codepoint >> 0) & 0x3f) | 0x80));
-        } else if (codepoint <= 0xffff) {
-            append((char)(((codepoint >> 12) & 0x0f) | 0xe0));
-            append((char)(((codepoint >> 6) & 0x3f) | 0x80));
-            append((char)(((codepoint >> 0) & 0x3f) | 0x80));
-        } else if (codepoint <= 0x10ffff) {
-            append((char)(((codepoint >> 18) & 0x07) | 0xf0));
-            append((char)(((codepoint >> 12) & 0x3f) | 0x80));
-            append((char)(((codepoint >> 6) & 0x3f) | 0x80));
-            append((char)(((codepoint >> 0) & 0x3f) | 0x80));
-        } else {
-            append(0xef);
-            append(0xbf);
-            append(0xbd);
-        }
+        append_codepoint(codepoint);
     }
 }
 
diff --git a/AK/StringBuilder.h b/AK/StringBuilder.h
index 53665b86ab..009c9a55bd 100644
--- a/AK/StringBuilder.h
+++ b/AK/StringBuilder.h
@@ -42,6 +42,7 @@ public:
     void append(const StringView&);
     void append(const Utf32View&);
     void append(char);
+    void append_codepoint(u32);
     void append(const char*, size_t);
     void appendf(const char*, ...);
     void appendvf(const char*, va_list);