diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -1921,8 +1921,10 @@
 }
 
 void Sema::DiagnoseUnusedButSetDecl(const VarDecl *VD) {
-  // If it's not referenced, it can't be set.
-  if (!VD->isReferenced() || !VD->getDeclName() || VD->hasAttr<UnusedAttr>())
+  // If it's not referenced, it can't be set. If it has the Cleanup attribute,
+  // it's not really unused.
+  if (!VD->isReferenced() || !VD->getDeclName() || VD->hasAttr<UnusedAttr>() ||
+      VD->hasAttr<CleanupAttr>())
     return;
 
   const auto *Ty = VD->getType().getTypePtr()->getBaseElementTypeUnsafe();
diff --git a/clang/test/Sema/warn-unused-but-set-variables.c b/clang/test/Sema/warn-unused-but-set-variables.c
--- a/clang/test/Sema/warn-unused-but-set-variables.c
+++ b/clang/test/Sema/warn-unused-but-set-variables.c
@@ -49,3 +49,13 @@
   x = 0;
   (void) sizeof(x);
 }
+
+void for_cleanup(int *x) {
+  *x = 0;
+}
+
+void f3(void) {
+  // Don't warn if the __cleanup__ attribute is used.
+  __attribute__((__cleanup__(for_cleanup))) int x;
+  x = 5;
+}