diff --git a/clang-tools-extra/clangd/refactor/tweaks/DefineOutline.cpp b/clang-tools-extra/clangd/refactor/tweaks/DefineOutline.cpp
--- a/clang-tools-extra/clangd/refactor/tweaks/DefineOutline.cpp
+++ b/clang-tools-extra/clangd/refactor/tweaks/DefineOutline.cpp
@@ -325,6 +325,14 @@
 // initializers.
 SourceRange getDeletionRange(const FunctionDecl *FD,
                              const syntax::TokenBuffer &TokBuf) {
+  if (FD->isExplicitlyDefaulted()) {
+    auto Toks =
+        TokBuf.expandedTokens({FD->getTypeSpecEndLoc(), FD->getDefaultLoc()});
+    Toks = Toks.drop_until(
+        [](const syntax::Token &Tok) { return Tok.kind() == tok::equal; });
+    assert(Toks.size() == 2);
+    return {Toks.front().location(), Toks.back().endLocation()};
+  }
   auto DeletionRange = FD->getBody()->getSourceRange();
   if (auto *CD = llvm::dyn_cast<CXXConstructorDecl>(FD)) {
     // AST doesn't contain the location for ":" in ctor initializers. Therefore
@@ -395,7 +403,10 @@
 
     Source = getSelectedFunction(Sel.ASTSelection.commonAncestor());
     // Bail out if the selection is not a in-line function definition.
-    if (!Source || !Source->doesThisDeclarationHaveABody() ||
+    // unless its a not-trivial special member function
+    if (!Source ||
+        (!Source->doesThisDeclarationHaveABody() &&
+        (!Source->isExplicitlyDefaulted() || Source->isTrivial())) ||
         Source->isOutOfLine())
       return false;
 
diff --git a/clang-tools-extra/clangd/unittests/tweaks/DefineOutlineTests.cpp b/clang-tools-extra/clangd/unittests/tweaks/DefineOutlineTests.cpp
--- a/clang-tools-extra/clangd/unittests/tweaks/DefineOutlineTests.cpp
+++ b/clang-tools-extra/clangd/unittests/tweaks/DefineOutlineTests.cpp
@@ -110,6 +110,22 @@
       };
     } // namespace
   )cpp");
+
+  // Not available on trivially defaulted functions
+  EXPECT_UNAVAILABLE(R"cpp(
+    struct A { A (); };
+    struct B { 
+      A a;
+      B^() = default;
+    };
+  )cpp");
+  EXPECT_UNAVAILABLE(R"cpp(
+    struct A { ~A (); };
+    struct B { 
+      A a;
+      ~B^() = default;
+    };
+  )cpp");
 }
 
 TEST_F(DefineOutlineTest, FailsWithoutSource) {
@@ -325,6 +341,17 @@
           "class A { ~A(); };",
           "A::~A(){} ",
       },
+      // Defaulted Functions
+      {
+          "class A { A^() = default; };",
+          "class A { A() ; };",
+          "A::A() = default;",
+      },
+      {
+          "class A { ~A^() = default; };",
+          "class A { ~A() ; };",
+          "A::~A() = default;",
+      },
   };
   for (const auto &Case : Cases) {
     SCOPED_TRACE(Case.Test);