diff --git a/doomsday/libdeng/include/de/str.h b/doomsday/libdeng/include/de/str.h
index e0e206e18b..a5e13cdc77 100644
--- a/doomsday/libdeng/include/de/str.h
+++ b/doomsday/libdeng/include/de/str.h
@@ -212,10 +212,25 @@ DENG_PUBLIC Str* Str_Prepend(Str* ds, const char* prependText);
 DENG_PUBLIC Str* Str_PrependChar(Str* ds, char ch);
 
 /**
- * This is safe for all strings.
+ * Determines the length of the string in characters.
+ * This is safe for all strings. @see Str_Size()
+ *
+ * @param ds  String instance.
+ *
+ * @return Length of the string as an integer.
  */
 DENG_PUBLIC int Str_Length(const Str* ds);
 
+/**
+ * Determines the length of the string in characters.
+ * This is safe for all strings. @see Str_Length()
+ *
+ * @param ds  String instance.
+ *
+ * @return Length of the string.
+ */
+DENG_PUBLIC size_t Str_Size(const Str* ds);
+
 DENG_PUBLIC boolean Str_IsEmpty(const Str* ds);
 
 /**
diff --git a/doomsday/libdeng/src/str.c b/doomsday/libdeng/src/str.c
index beb7981a2f..74efd25aa3 100644
--- a/doomsday/libdeng/src/str.c
+++ b/doomsday/libdeng/src/str.c
@@ -390,6 +390,11 @@ char* Str_Text(const ddstring_t* str)
 }
 
 int Str_Length(const ddstring_t* str)
+{
+    return (int) Str_Size(str);
+}
+
+size_t Str_Size(const Str* str)
 {
     DENG_ASSERT(str);
 
@@ -398,7 +403,7 @@ int Str_Length(const ddstring_t* str)
     {
         return str->length;
     }
-    return (int)strlen(Str_Text(str));
+    return strlen(Str_Text(str));
 }
 
 boolean Str_IsEmpty(const ddstring_t* str)