--- a/src/c/symbols_list2.h
+++ b/src/c/symbols_list2.h
@@ -1714,6 +1714,7 @@
 {CLOS_ "STANDARD-DIRECT-SLOT-DEFINITION",NULL},
 {CLOS_ "STANDARD-EFFECTIVE-SLOT-DEFINITION",NULL},
 {CLOS_ "STANDARD-INSTANCE-ACCESS","ECL_NAME(clos_standard_instance_access)"},
+{CLOS_ "STANDARD-INSTANCE-SET","ECL_NAME(clos_standard_instance_set)"},
 {CLOS_ "STANDARD-READER-METHOD",NULL},
 {CLOS_ "STANDARD-SLOT-DEFINITION",NULL},
 {CLOS_ "STANDARD-WRITER-METHOD",NULL},