diff --git a/AK/String.cpp b/AK/String.cpp
index 3c31537f55..360f647947 100644
--- a/AK/String.cpp
+++ b/AK/String.cpp
@@ -239,21 +239,6 @@ template Optional<u16> String::to_uint() const;
 template Optional<u32> String::to_uint() const;
 template Optional<u64> String::to_uint() const;
 
-template<typename T>
-String String::number(T value) { return formatted("{}", value); }
-
-template String String::number(unsigned char);
-template String String::number(unsigned short);
-template String String::number(unsigned int);
-template String String::number(unsigned long);
-template String String::number(unsigned long long);
-template String String::number(char);
-template String String::number(short);
-template String String::number(int);
-template String String::number(long);
-template String String::number(long long);
-template String String::number(signed char);
-
 String String::format(const char* fmt, ...)
 {
     StringBuilder builder;
diff --git a/AK/String.h b/AK/String.h
index 00544a008c..a522db1108 100644
--- a/AK/String.h
+++ b/AK/String.h
@@ -252,8 +252,8 @@ public:
         return vformatted(fmtstr, VariadicFormatParams { parameters... });
     }
 
-    template<typename T>
-    static String number(T);
+    template<typename T, typename EnableIf<IsArithmetic<T>::value>::Type* = nullptr>
+    static String number(T value) { return formatted("{}", value); }
 
     StringView view() const;