diff --git a/src/utils/ast-helpers.ts b/src/utils/ast-helpers.ts
index a94c7e6d..62dab9df 100644
--- a/src/utils/ast-helpers.ts
+++ b/src/utils/ast-helpers.ts
@@ -87,7 +87,7 @@ export function findMethodCallExpressions(node: Node, propName: string, fnName:
 }
 
 export function findClassPropertiesConstructorParameterByType(node: ClassDeclaration, type: string): string[] {
-	const query = `Constructor Parameter:has(TypeReference > Identifier[name="${type}"]):has(PublicKeyword,ProtectedKeyword,PrivateKeyword) > Identifier`;
+	const query = `Constructor Parameter:has(TypeReference > Identifier[name="${type}"]):has(PublicKeyword,ProtectedKeyword,PrivateKeyword,ReadonlyKeyword) > Identifier`;
 	const result = tsquery<Identifier>(node, query);
 	return result.map((n) => n.text);
 }
diff --git a/tests/parsers/service.parser.spec.ts b/tests/parsers/service.parser.spec.ts
index 3dc36d88..f3c59d0b 100644
--- a/tests/parsers/service.parser.spec.ts
+++ b/tests/parsers/service.parser.spec.ts
@@ -32,6 +32,25 @@ describe('ServiceParser', () => {
 		expect(keys).to.deep.equal(['It works!']);
 	});
 
+	it('should locate TranslateService when injected with public, protected, private and readonly keyword', () => {
+		const ACCESSORS = ['public', 'protected', 'private', 'readonly'];
+
+		ACCESSORS.forEach((accessor) => {
+			const contents = `
+				@Component({ })
+				export class AppComponent {
+					public constructor(${accessor} _translateService: TranslateService) { }
+					public test() {
+						this._translateService.get('Hello get');
+						this._translateService.instant('Hello instant');
+						this._translateService.stream('Hello stream');
+					}
+				`;
+			const keys = parser.extract(contents, componentFilename)?.keys();
+			expect(keys).to.deep.equal(['Hello get', 'Hello instant', 'Hello stream'], `Accessor value: "${accessor}"`);
+		});
+	});
+
 	it('should support extracting binary expressions', () => {
 		const contents = `
 			@Component({ })