diff --git a/src/globals.h b/src/globals.h
index 9337134..84adb7f 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1346,6 +1346,7 @@
 EXTERN char_u e_readonly[]	INIT(=N_("E45: 'readonly' option is set (add ! to override)"));
 #ifdef FEAT_EVAL
 EXTERN char_u e_readonlyvar[]	INIT(=N_("E46: Cannot set read-only variable \"%s\""));
+EXTERN char_u e_readonlysbx[]	INIT(=N_("E46: Cannot set variable in the sandbox: \"%s\""));
 #endif
 #ifdef FEAT_QUICKFIX
 EXTERN char_u e_readerrf[]	INIT(=N_("E47: Error while reading errorfile"));