diff --git a/clang/lib/Sema/SemaModule.cpp b/clang/lib/Sema/SemaModule.cpp
index 67658c93ed3ba..ad118ac90e4aa 100644
--- a/clang/lib/Sema/SemaModule.cpp
+++ b/clang/lib/Sema/SemaModule.cpp
@@ -1003,6 +1003,10 @@ Decl *Sema::ActOnFinishExportDecl(Scope *S, Decl *D, SourceLocation RBraceLoc) {
     }
   }
 
+  // Anything exported from a module should never be considered unused.
+  for (auto *Exported : ED->decls())
+    Exported->markUsed(getASTContext());
+
   return D;
 }
 
diff --git a/clang/test/Modules/pr85122.cppm b/clang/test/Modules/pr85122.cppm
new file mode 100644
index 0000000000000..a4c89f13711a3
--- /dev/null
+++ b/clang/test/Modules/pr85122.cppm
@@ -0,0 +1,6 @@
+// RUN: %clang_cc1 -std=c++20 %s -Wall -fsyntax-only -verify
+
+// expected-no-diagnostics
+export module a;
+
+export constexpr auto a = []{};