--- libdaemon/dexec.h
+++ libdaemon/dexec.h
@@ -46,7 +46,11 @@
  * @param ... The arguments to be passed to the program, followed by a (char *) NULL
  * @return Nonzero on failure, zero on success
  */
-int daemon_exec(const char *dir, int *ret, const char *prog, ...);
+int daemon_exec(const char *dir, int *ret, const char *prog, ...) 
+#if defined(__GNUC__) && (__GNUC__ >= 4)
+__attribute__((__sentinel__(0)))
+#endif
+;
 
 #ifdef __cplusplus
 }