diff --git a/src/c/symbols_list.h b/src/c/symbols_list.h
index e0a1c1562..0211685c8 100755
--- a/src/c/symbols_list.h
+++ b/src/c/symbols_list.h
@@ -1925,6 +1925,7 @@ cl_symbols[] = {
 
 {KEY_ "SYSV", KEYWORD, NULL, -1, OBJNULL},
 {KEY_ "UNIX64", KEYWORD, NULL, -1, OBJNULL},
+{KEY_ "WIN64", KEYWORD, NULL, -1, OBJNULL},
 
 {EXT_ "WEAK-POINTER", EXT_ORDINARY, NULL, -1, OBJNULL},
 {EXT_ "MAKE-WEAK-POINTER", EXT_ORDINARY, si_make_weak_pointer, 1, OBJNULL},
diff --git a/src/c/symbols_list2.h b/src/c/symbols_list2.h
index 5ff3a86ae..bebb443cf 100644
--- a/src/c/symbols_list2.h
+++ b/src/c/symbols_list2.h
@@ -1925,6 +1925,7 @@ cl_symbols[] = {
 
 {KEY_ "SYSV",NULL},
 {KEY_ "UNIX64",NULL},
+{KEY_ "WIN64",NULL},
 
 {EXT_ "WEAK-POINTER",NULL},
 {EXT_ "MAKE-WEAK-POINTER","si_make_weak_pointer"},