diff --git a/stdlib/public/core/FloatingPointTypes.swift.gyb b/stdlib/public/core/FloatingPointTypes.swift.gyb
index 1e71b1bb4fac0..dbfa75cf46c30 100644
--- a/stdlib/public/core/FloatingPointTypes.swift.gyb
+++ b/stdlib/public/core/FloatingPointTypes.swift.gyb
@@ -1353,7 +1353,7 @@ internal struct _${Self}AnyHashableBox: _AnyHashableBox {
 ${SelfDocComment}
 @frozen
 %  if bits == 16:
-@available(iOS 14, tvOS 14, watchOS 7, *)
+@available(macOS 11, iOS 14, tvOS 14, watchOS 7, *)
 @available(macOS, unavailable)
 @available(macCatalyst, unavailable)
 %  else:
diff --git a/test/IRGen/float16_macos.swift b/test/IRGen/float16_macos.swift
new file mode 100644
index 0000000000000..7293254fe495f
--- /dev/null
+++ b/test/IRGen/float16_macos.swift
@@ -0,0 +1,15 @@
+// RUN: %target-swift-frontend -emit-ir %s -target x86_64-apple-macos10.15 | %FileCheck %s --check-prefix=CHECK10
+// RUN: %target-swift-frontend -emit-ir %s -target x86_64-apple-macos11 | %FileCheck %s --check-prefix=CHECK11
+
+// REQUIRES: OS=macosx
+// REQUIRES: CPU=x86_64
+// UNSUPPORTED: use_os_stdlib
+
+@available(macOS 11, *)
+public struct Float16Wrapper {
+  @available(macOS, unavailable)
+  var x: Float16
+}
+
+// CHECK10-LABEL: @"$ss7Float16VMn" = extern_weak global %swift.type_descriptor
+// CHECK11-LABEL: @"$ss7Float16VMn" = external global %swift.type_descriptor