diff --git a/gcc/config/darwin.cc b/gcc/config/darwin.cc
index a98826ac4ca..213d32cc1a2 100644
--- a/gcc/config/darwin.cc
+++ b/gcc/config/darwin.cc
@@ -2336,10 +2336,10 @@ darwin_handle_weak_import_attribute (tree *node, tree name,
   return NULL_TREE;
 }
 
-#define NUM_AV_OSES 12
+#define NUM_AV_OSES 13
 const char *availability_os[NUM_AV_OSES]
   = { "macos", "macosx", "ios", "tvos", "watchos", "driverkit", "swift",
-      "maccatalyst", "xros", "visionos", "android", "zos" };
+      "maccatalyst", "macCatalyst", "xros", "visionos", "android", "zos" };
 
 #define NUM_AV_CLAUSES 6
 const char *availability_clause[NUM_AV_CLAUSES]