diff --git a/include/swift/AST/DiagnosticsSema.def b/include/swift/AST/DiagnosticsSema.def
index b31c4b067c72c..8eb65cf0dc4f0 100644
--- a/include/swift/AST/DiagnosticsSema.def
+++ b/include/swift/AST/DiagnosticsSema.def
@@ -1524,6 +1524,9 @@ WARNING(access_control_non_objc_open_member,none,
 
 ERROR(invalid_decl_attribute,none,
       "'%0' attribute cannot be applied to this declaration", (DeclAttribute))
+ERROR(attr_invalid_on_decl_kind,none,
+      "'%0' attribute cannot be applied to %1 declarations",
+      (DeclAttribute, DescriptiveDeclKind))
 ERROR(invalid_decl_modifier,none,
       "%0 modifier cannot be applied to this declaration", (DeclAttribute))
 ERROR(attribute_does_not_apply_to_type,none,
diff --git a/lib/Sema/TypeCheckAttr.cpp b/lib/Sema/TypeCheckAttr.cpp
index 2e50d65452457..6e21cb32e10b7 100644
--- a/lib/Sema/TypeCheckAttr.cpp
+++ b/lib/Sema/TypeCheckAttr.cpp
@@ -3626,6 +3626,12 @@ void AttributeChecker::checkBackDeployAttrs(ArrayRef<BackDeployAttr *> Attrs) {
       }
     }
 
+    if (isa<DestructorDecl>(D) || isa<ConstructorDecl>(D)) {
+      diagnoseAndRemoveAttr(Attr, diag::attr_invalid_on_decl_kind, Attr,
+                            D->getDescriptiveKind());
+      continue;
+    }
+
     auto AtLoc = Attr->AtLoc;
     auto Platform = Attr->Platform;
 
diff --git a/test/attr/attr_backDeploy.swift b/test/attr/attr_backDeploy.swift
index d290de07360a0..a107b5630fdc3 100644
--- a/test/attr/attr_backDeploy.swift
+++ b/test/attr/attr_backDeploy.swift
@@ -128,6 +128,16 @@ extension TopLevelProtocol {
 @_backDeploy(before: macOS 12.0) // expected-error {{'@_backDeploy' attribute cannot be applied to this declaration}}
 public class CannotBackDeployClass {}
 
+public final class CannotBackDeployClassInitDeinit {
+  @available(macOS 11.0, *)
+  @_backDeploy(before: macOS 12.0) // expected-error {{'@_backDeploy' attribute cannot be applied to initializer declarations}}
+  public init() {}
+
+  @available(macOS 11.0, *)
+  @_backDeploy(before: macOS 12.0) // expected-error {{'@_backDeploy' attribute cannot be applied to deinitializer declarations}}
+  deinit {}
+}
+
 @_backDeploy(before: macOS 12.0) // expected-error {{'@_backDeploy' attribute cannot be applied to this declaration}}
 public struct CannotBackDeployStruct {
   @_backDeploy(before: macOS 12.0) // expected-error {{'@_backDeploy' must not be used on stored properties}}