@@ -18,10 +18,12 @@
 #include <stdarg.h>
 #include <inttypes.h>
 
 #import "OFObject.h"
 #import "OFSerialization.h"
+
+@class OFConstantString;
 
 typedef uint32_t of_unichar_t;
 
 /**
  * \brief The encoding of a string.
@@ -207,11 +209,11 @@
  * See printf for the format syntax.
  *
  * \param format A string used as format to initialize the OFString
  * \return A new autoreleased OFString
  */
-+ stringWithFormat: (OFString*)format, ...;
++ stringWithFormat: (OFConstantString*)format, ...;
 
 /**
  * Creates a new OFString containing the constructed specified path.
  *
  * \param firstComponent The first component of the path
@@ -405,21 +407,21 @@
  * See printf for the format syntax.
  *
  * \param format A string used as format to initialize the OFString
  * \return An initialized OFString
  */
-- initWithFormat: (OFString*)format, ...;
+- initWithFormat: (OFConstantString*)format, ...;
 
 /**
  * Initializes an already allocated OFString with a format string.
  * See printf for the format syntax.
  *
  * \param format A string used as format to initialize the OFString
  * \param arguments The arguments used in the format string
  * \return An initialized OFString
  */
-- initWithFormat: (OFString*)format
+- initWithFormat: (OFConstantString*)format
        arguments: (va_list)arguments;
 
 /**
  * Initializes an already allocated OFString with the constructed specified
  * path.