diff --git a/src/misc/helpers.h b/src/misc/helpers.h
index 7fb8a7d..af669bb 100644
--- a/src/misc/helpers.h
+++ b/src/misc/helpers.h
@@ -67,4 +67,6 @@ const char * command2args( std::string input_string );
  */
 std::string get_absolute_path(const std::string &relative_path);
 
+ssize_t write_all(int fd, const void *buf, size_t count);
+
 #endif //REX_HELPERS_H