diff --git a/AK/String.cpp b/AK/String.cpp
index 3e188c49e8..c7315f2b5b 100644
--- a/AK/String.cpp
+++ b/AK/String.cpp
@@ -129,6 +129,13 @@ String String::isolated_copy() const
     return String(move(*impl));
 }
 
+String String::substring(size_t start) const
+{
+    ASSERT(m_impl);
+    ASSERT(start <= length());
+    return { characters() + start, length() - start };
+}
+
 String String::substring(size_t start, size_t length) const
 {
     if (!length)
diff --git a/AK/String.h b/AK/String.h
index f854911313..edeceeb87b 100644
--- a/AK/String.h
+++ b/AK/String.h
@@ -134,6 +134,7 @@ public:
 
     Vector<String> split_limit(char separator, size_t limit, bool keep_empty = false) const;
     Vector<String> split(char separator, bool keep_empty = false) const;
+    String substring(size_t start) const;
     String substring(size_t start, size_t length) const;
 
     Vector<StringView> split_view(char separator, bool keep_empty = false) const;