diff --git a/test/ClangImporter/Inputs/custom-modules/module.modulemap b/test/ClangImporter/Inputs/custom-modules/module.modulemap
index 2bd2627191949..89ccced682ba0 100644
--- a/test/ClangImporter/Inputs/custom-modules/module.modulemap
+++ b/test/ClangImporter/Inputs/custom-modules/module.modulemap
@@ -279,3 +279,7 @@ module "Weird C Module" {
 module Aliases {
   header "Aliases.h"
 }
+
+module RetroactiveVersioning {
+  header "versioning.h"
+}
diff --git a/test/ClangImporter/Inputs/custom-modules/versioning.h b/test/ClangImporter/Inputs/custom-modules/versioning.h
new file mode 100644
index 0000000000000..dcc6bb0840ee7
--- /dev/null
+++ b/test/ClangImporter/Inputs/custom-modules/versioning.h
@@ -0,0 +1,9 @@
+#pragma once
+extern const int kVersion;
+extern const int kVersion1;
+extern const int kVersion2;
+#if OLD_DEPLOYMENT_TARGET
+#define kVersion kVersion1
+#else
+#define kVersion kVersion2
+#endif
diff --git a/test/ClangImporter/versioning.swift b/test/ClangImporter/versioning.swift
new file mode 100644
index 0000000000000..a5077b92ecd1f
--- /dev/null
+++ b/test/ClangImporter/versioning.swift
@@ -0,0 +1,7 @@
+// RUN: %target-typecheck-verify-swift %s -I %S/Inputs/custom-modules
+// XFAIL: *
+
+// expected-no-diagnostics
+
+import RetroactiveVersioning
+let _ = kVersion