diff --git a/src/structs.h b/src/structs.h
index d33ddb2..d020449 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -4820,6 +4820,17 @@
     // Currently only used for boolean options.
     int		os_doskip;
 
+    // Option value was checked to be safe, no need to set P_INSECURE
+    // Used for the 'keymap', 'filetype' and 'syntax' options.
+    int		os_value_checked;
+    // Option value changed.  Used for the 'filetype' and 'syntax' options.
+    int		os_value_changed;
+
+    // Used by the 'isident', 'iskeyword', 'isprint' and 'isfname' options.
+    // Set to TRUE if the character table is modified when processing the
+    // option and need to be restored because of a failure.
+    int		os_restore_chartab;
+
     // If the value specified for an option is not valid and the error message
     // is parameterized, then the "os_errbuf" buffer is used to store the error
     // message (when it is not NULL).