diff --git a/clang-tools-extra/clangd/Diagnostics.cpp b/clang-tools-extra/clangd/Diagnostics.cpp
--- a/clang-tools-extra/clangd/Diagnostics.cpp
+++ b/clang-tools-extra/clangd/Diagnostics.cpp
@@ -631,7 +631,10 @@
 /// the result is not too large and does not contain newlines.
 static void writeCodeToFixMessage(llvm::raw_ostream &OS, llvm::StringRef Code) {
   constexpr unsigned MaxLen = 50;
-
+  if (Code == "\n") {
+    OS << "\\n";
+    return;
+  }
   // Only show the first line if there are many.
   llvm::StringRef R = Code.split('\n').first;
   // Shorten the message if it's too long.
diff --git a/clang-tools-extra/clangd/unittests/DiagnosticsTests.cpp b/clang-tools-extra/clangd/unittests/DiagnosticsTests.cpp
--- a/clang-tools-extra/clangd/unittests/DiagnosticsTests.cpp
+++ b/clang-tools-extra/clangd/unittests/DiagnosticsTests.cpp
@@ -623,6 +623,15 @@
                   Fix(Source.range(), "ident", "change 'ide\\…' to 'ident'"))));
 }
 
+TEST(DiagnosticTest, NewLineFixMessage) {
+  Annotations Source("int a;[[]]");
+  TestTU TU = TestTU::withCode(Source.code());
+  TU.ExtraArgs = {"-Wnewline-eof"};
+  EXPECT_THAT(
+      *TU.build().getDiagnostics(),
+      ElementsAre(WithFix((Fix(Source.range(), "\n", "insert '\\n'")))));
+}
+
 TEST(DiagnosticTest, ClangTidySuppressionCommentTrumpsWarningAsError) {
   Annotations Main(R"cpp(
     int main() {