diff --git a/lib/ClangImporter/ClangImporter.cpp b/lib/ClangImporter/ClangImporter.cpp
index 6694955b3139..c3b747062d53 100644
--- a/lib/ClangImporter/ClangImporter.cpp
+++ b/lib/ClangImporter/ClangImporter.cpp
@@ -4363,6 +4363,9 @@ ClangImporter::getSwiftExplicitModuleDirectCC1Args() const {
   FEOpts.IncludeTimestamps = false;
   FEOpts.ModuleMapFiles.clear();
 
+  // APINotesOptions.
+  instance.getAPINotesOpts().ModuleSearchPaths.clear();
+
   // IndexStorePath is forwarded from swift.
   FEOpts.IndexStorePath.clear();
 
diff --git a/test/CAS/apinotes.swift b/test/CAS/apinotes.swift
new file mode 100644
index 000000000000..144ea3dbd285
--- /dev/null
+++ b/test/CAS/apinotes.swift
@@ -0,0 +1,29 @@
+// REQUIRES: objc_interop
+
+// RUN: %empty-directory(%t)
+// RUN: split-file %s %t
+
+// RUN: %target-swift-frontend -scan-dependencies -module-name Test -module-cache-path %t/clang-module-cache -O \
+// RUN:   -disable-implicit-string-processing-module-import -disable-implicit-concurrency-module-import \
+// RUN:   %t/main.swift -o %t/deps.json -swift-version 5 -cache-compile-job -cas-path %t/cas -I %t
+
+// RUN: %FileCheck --input-file=%t/deps.json %s
+
+// CHECK-NOT: -iapinotes-modules
+
+//--- main.swift
+import A
+
+//--- module.modulemap
+module A { header "A.h" export *}
+
+//--- A.h
+#pragma once
+void a(void);
+
+//--- A.apinotes
+Name: A
+Functions:
+  - Name: a
+    Availability: none
+    AvailabilityMsg: "don't use this"