diff --git a/basis/system-info/macosx/macosx.factor b/basis/system-info/macosx/macosx.factor
index a4d8f91ead..7f6b5e9aaa 100644
--- a/basis/system-info/macosx/macosx.factor
+++ b/basis/system-info/macosx/macosx.factor
@@ -22,7 +22,7 @@ FUNCTION: OSErr Gestalt ( OSType selector, SInt32* response )
 : system-version-bugfix ( -- n ) "sys3" be> gestalt ;
 
 CONSTANT: system-code-names H{
-    { { 10 16 } "Big Sur" }
+    { { 11 0 } "Big Sur" }
     { { 10 15 } "Catalina" }
     { { 10 14 } "Mojave" }
     { { 10 13 } "High Sierra" }