diff --git a/src/String.c b/src/String.c
index d597ec8..2c53d62 100644
--- a/src/String.c
+++ b/src/String.c
@@ -3,8 +3,13 @@
 
 String * String_new(const char * s)
 {
-    String * new_st = (String *)malloc(sizeof(String));
     size_t size = strlen(s);
+    return String_new_size(s, size);
+}
+
+String * String_new_size(const char * s, size_t size)
+{
+    String * new_st = (String *)malloc(sizeof(String));
     char * smem = (char *)malloc(size + 1u);
     memcpy(smem, s, size);
     smem[size] = '\0';
diff --git a/src/String.h b/src/String.h
index 921c56e..385e70c 100644
--- a/src/String.h
+++ b/src/String.h
@@ -10,6 +10,7 @@ typedef struct
 } String;
 
 String * String_new(const char * s);
+String * String_new_size(const char * s, size_t size);
 String * String_plus(const String * st, const char * s);
 String * String_concat(String * st, const char * s);
 static inline char * String_cstr(const String * st) { return st->value; }