@@ -50,11 +50,11 @@
  *
  * \param program The program to execute. If it does not start with a slash, the
  *		  search path specified in PATH is used.
  * \return A new, autoreleased OFProcess.
  */
-+ processWithProgram: (OFString*)program;
++ (instancetype)processWithProgram: (OFString*)program;
 
 /**
  * \brief Creates a new OFProcess with the specified program and arguments and
  *	  invokes the program.
  *
@@ -61,12 +61,12 @@
  * \param program The program to execute. If it does not start with a slash, the
  *		  search path specified in PATH is used.
  * \param arguments The arguments to pass to the program, or nil
  * \return A new, autoreleased OFProcess.
  */
-+ processWithProgram: (OFString*)program
-	   arguments: (OFArray*)arguments;
++ (instancetype)processWithProgram: (OFString*)program
+			 arguments: (OFArray*)arguments;
 
 /**
  * \brief Creates a new OFProcess with the specified program, program name and
  *	  arguments and invokes the program.
  *
@@ -75,13 +75,13 @@
  * \param programName The program name for the program to invoke (argv[0]).
  *		      Usually, this is equal to program.
  * \param arguments The arguments to pass to the program, or nil
  * \return A new, autoreleased OFProcess.
  */
-+ processWithProgram: (OFString*)program
-	 programName: (OFString*)programName
-	   arguments: (OFArray*)arguments;
++ (instancetype)processWithProgram: (OFString*)program
+		       programName: (OFString*)programName
+			 arguments: (OFArray*)arguments;
 
 /**
  * \brief Initializes an already allocated OFProcess with the specified program
  *	  and invokes the program.
  *