diff --git a/src/rules/no-unnormalized-keys.js b/src/rules/no-unnormalized-keys.js
index 920d216..eab9138 100644
--- a/src/rules/no-unnormalized-keys.js
+++ b/src/rules/no-unnormalized-keys.js
@@ -20,6 +20,22 @@ import { getKey, getRawKey } from "../util.js";
  * @typedef {JSONRuleDefinition<{ RuleOptions: [NoUnnormalizedKeysOptions], MessageIds: NoUnnormalizedKeysMessageIds }>} NoUnnormalizedKeysRuleDefinition
  */
 
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+/**
+ * Escapes a normalized string key for use inside its original quotes.
+ * @param {string} normalizedKey The normalized key to escape.
+ * @param {string} quote The quote character used in the original key.
+ * @returns {string} The escaped key.
+ */
+function escapeKey(normalizedKey, quote) {
+	return normalizedKey
+		.replaceAll("\\", "\\\\")
+		.replaceAll(quote, `\\${quote}`);
+}
+
 //-----------------------------------------------------------------------------
 // Rule Definition
 //-----------------------------------------------------------------------------
@@ -62,19 +78,20 @@ export default /** @satisfies {NoUnnormalizedKeysRuleDefinition} */ ({
 	},
 
 	create(context) {
+		const { sourceCode } = context;
 		const [{ form }] = context.options;
 
 		return /** @type {JSONRuleVisitor} */ ({
 			Member(node) {
 				const key = getKey(node);
-				const rawKey = getRawKey(node, context.sourceCode);
+				const rawKey = getRawKey(node, sourceCode);
 				const normalizedKey = key.normalize(form);
 
 				if (normalizedKey !== key) {
-					const { name } = node;
+					const { loc, range, type } = node.name;
 
 					context.report({
-						loc: name.loc,
+						loc,
 						messageId: "unnormalizedKey",
 						data: {
 							key: rawKey,
@@ -86,10 +103,15 @@ export default /** @satisfies {NoUnnormalizedKeysRuleDefinition} */ ({
 							}
 
 							return fixer.replaceTextRange(
-								name.type === "String"
-									? [name.range[0] + 1, name.range[1] - 1]
-									: name.range,
-								normalizedKey,
+								type === "String"
+									? [range[0] + 1, range[1] - 1]
+									: range,
+								type === "String"
+									? escapeKey(
+											normalizedKey,
+											sourceCode.text[range[0]],
+										)
+									: normalizedKey,
 							);
 						},
 					});
diff --git a/tests/rules/no-unnormalized-keys.test.js b/tests/rules/no-unnormalized-keys.test.js
index 6e12151..3d0d271 100644
--- a/tests/rules/no-unnormalized-keys.test.js
+++ b/tests/rules/no-unnormalized-keys.test.js
@@ -260,6 +260,209 @@ ruleTester.run("no-unnormalized-keys", rule, {
 				},
 			],
 		},
+		{
+			code: `{"a\uff02b": 1}`,
+			output: String.raw`{"a\"b": 1}`,
+			options: [{ form: "NFKC" }],
+			errors: [
+				{
+					messageId: "unnormalizedKey",
+					data: { key: "a\uff02b" },
+					line: 1,
+					column: 2,
+					endLine: 1,
+					endColumn: 7,
+				},
+			],
+		},
+		{
+			code: `{"a\uff07b": 1}`,
+			output: String.raw`{"a'b": 1}`,
+			options: [{ form: "NFKC" }],
+			errors: [
+				{
+					messageId: "unnormalizedKey",
+					data: { key: "a\uff07b" },
+					line: 1,
+					column: 2,
+					endLine: 1,
+					endColumn: 7,
+				},
+			],
+		},
+		{
+			code: `{"a\uff3cb": 1}`,
+			output: String.raw`{"a\\b": 1}`,
+			options: [{ form: "NFKC" }],
+			errors: [
+				{
+					messageId: "unnormalizedKey",
+					data: { key: "a\uff3cb" },
+					line: 1,
+					column: 2,
+					endLine: 1,
+					endColumn: 7,
+				},
+			],
+		},
+		{
+			code: `{'a\uff07b': 1}`,
+			output: String.raw`{'a\'b': 1}`,
+			language: "json/json5",
+			options: [{ form: "NFKC" }],
+			errors: [
+				{
+					messageId: "unnormalizedKey",
+					data: { key: "a\uff07b" },
+					line: 1,
+					column: 2,
+					endLine: 1,
+					endColumn: 7,
+				},
+			],
+		},
+		{
+			code: `{'a\uff02b': 1}`,
+			output: String.raw`{'a"b': 1}`,
+			language: "json/json5",
+			options: [{ form: "NFKC" }],
+			errors: [
+				{
+					messageId: "unnormalizedKey",
+					data: { key: "a\uff02b" },
+					line: 1,
+					column: 2,
+					endLine: 1,
+					endColumn: 7,
+				},
+			],
+		},
+		{
+			code: `{"a\uff02b\uff3cc\uff07\uff02\uff3c": 1}`,
+			output: String.raw`{"a\"b\\c'\"\\": 1}`,
+			options: [{ form: "NFKC" }],
+			errors: [
+				{
+					messageId: "unnormalizedKey",
+					data: { key: "a\uff02b\uff3cc\uff07\uff02\uff3c" },
+					line: 1,
+					column: 2,
+					endLine: 1,
+					endColumn: 12,
+				},
+			],
+		},
+		{
+			code: `{"a\uff02b\uff3cc\uff07\uff02\uff3c": 1}`,
+			output: String.raw`{"a\"b\\c'\"\\": 1}`,
+			language: "json/jsonc",
+			options: [{ form: "NFKC" }],
+			errors: [
+				{
+					messageId: "unnormalizedKey",
+					data: { key: "a\uff02b\uff3cc\uff07\uff02\uff3c" },
+					line: 1,
+					column: 2,
+					endLine: 1,
+					endColumn: 12,
+				},
+			],
+		},
+		{
+			code: `{"a\uff02b\uff3cc\uff07\uff02\uff3c": 1}`,
+			output: String.raw`{"a\"b\\c'\"\\": 1}`,
+			language: "json/json5",
+			options: [{ form: "NFKC" }],
+			errors: [
+				{
+					messageId: "unnormalizedKey",
+					data: { key: "a\uff02b\uff3cc\uff07\uff02\uff3c" },
+					line: 1,
+					column: 2,
+					endLine: 1,
+					endColumn: 12,
+				},
+			],
+		},
+		{
+			code: `{'a\uff07b\uff3cc\uff02\uff07\uff3c': 1}`,
+			output: String.raw`{'a\'b\\c"\'\\': 1}`,
+			language: "json/json5",
+			options: [{ form: "NFKC" }],
+			errors: [
+				{
+					messageId: "unnormalizedKey",
+					data: { key: "a\uff07b\uff3cc\uff02\uff07\uff3c" },
+					line: 1,
+					column: 2,
+					endLine: 1,
+					endColumn: 12,
+				},
+			],
+		},
+		{
+			code: `{"a\uff02b\uff3cc\uff07\uff02\uff3c": 1}`,
+			output: String.raw`{"a\"b\\c'\"\\": 1}`,
+			options: [{ form: "NFKD" }],
+			errors: [
+				{
+					messageId: "unnormalizedKey",
+					data: { key: "a\uff02b\uff3cc\uff07\uff02\uff3c" },
+					line: 1,
+					column: 2,
+					endLine: 1,
+					endColumn: 12,
+				},
+			],
+		},
+		{
+			code: `{"a\uff02b\uff3cc\uff07\uff02\uff3c": 1}`,
+			output: String.raw`{"a\"b\\c'\"\\": 1}`,
+			language: "json/jsonc",
+			options: [{ form: "NFKD" }],
+			errors: [
+				{
+					messageId: "unnormalizedKey",
+					data: { key: "a\uff02b\uff3cc\uff07\uff02\uff3c" },
+					line: 1,
+					column: 2,
+					endLine: 1,
+					endColumn: 12,
+				},
+			],
+		},
+		{
+			code: `{"a\uff02b\uff3cc\uff07\uff02\uff3c": 1}`,
+			output: String.raw`{"a\"b\\c'\"\\": 1}`,
+			language: "json/json5",
+			options: [{ form: "NFKD" }],
+			errors: [
+				{
+					messageId: "unnormalizedKey",
+					data: { key: "a\uff02b\uff3cc\uff07\uff02\uff3c" },
+					line: 1,
+					column: 2,
+					endLine: 1,
+					endColumn: 12,
+				},
+			],
+		},
+		{
+			code: `{'a\uff07b\uff3cc\uff02\uff07\uff3c': 1}`,
+			output: String.raw`{'a\'b\\c"\'\\': 1}`,
+			language: "json/json5",
+			options: [{ form: "NFKD" }],
+			errors: [
+				{
+					messageId: "unnormalizedKey",
+					data: { key: "a\uff07b\uff3cc\uff02\uff07\uff3c" },
+					line: 1,
+					column: 2,
+					endLine: 1,
+					endColumn: 12,
+				},
+			],
+		},
 		// escaped form
 		{
 			code: `{"${escapedNfcO}":"NFC"}`,