diff --git a/AK/String.cpp b/AK/String.cpp
index 63cef36cdb..df8005bd85 100644
--- a/AK/String.cpp
+++ b/AK/String.cpp
@@ -184,6 +184,11 @@ unsigned String::to_uint(bool& ok) const
     return value;
 }
 
+String String::number(size_t value)
+{
+    return String::format("%zu", value);
+}
+
 String String::number(unsigned value)
 {
     return String::format("%u", value);
diff --git a/AK/String.h b/AK/String.h
index 0325f3831d..2b299841b9 100755
--- a/AK/String.h
+++ b/AK/String.h
@@ -194,6 +194,7 @@ public:
     }
 
     static String format(const char*, ...);
+    static String number(size_t);
     static String number(unsigned);
     static String number(int);