diff --git a/crates/oxc_isolated_declarations/src/class.rs b/crates/oxc_isolated_declarations/src/class.rs
index 5523dfc1f71dc..5065e90363874 100644
--- a/crates/oxc_isolated_declarations/src/class.rs
+++ b/crates/oxc_isolated_declarations/src/class.rs
@@ -402,7 +402,8 @@ impl<'a> IsolatedDeclarations<'a> {
                     };
 
                     if let MethodDefinitionKind::Constructor = method.kind {
-                        elements.extend(
+                        elements.splice(
+                            0..0,
                             self.transform_constructor_params_to_class_properties(
                                 function, &params,
                             ),
diff --git a/crates/oxc_isolated_declarations/tests/fixtures/class.ts b/crates/oxc_isolated_declarations/tests/fixtures/class.ts
index cd5a85d7113c7..3a4ee4213e62b 100644
--- a/crates/oxc_isolated_declarations/tests/fixtures/class.ts
+++ b/crates/oxc_isolated_declarations/tests/fixtures/class.ts
@@ -49,3 +49,8 @@ export class Bux {
     readonly prop3: number = 1,
   ) {}
 }
+
+export class PrivateFieldsWithConstructorAssignments {
+  private second = 0;
+  constructor(public first: number) {}
+}
\ No newline at end of file
diff --git a/crates/oxc_isolated_declarations/tests/snapshots/class.snap b/crates/oxc_isolated_declarations/tests/snapshots/class.snap
index 6087ed6875691..8b36375a9e3f8 100644
--- a/crates/oxc_isolated_declarations/tests/snapshots/class.snap
+++ b/crates/oxc_isolated_declarations/tests/snapshots/class.snap
@@ -46,3 +46,8 @@ export declare class Bux {
 	readonly prop3: number;
 	private constructor();
 }
+export declare class PrivateFieldsWithConstructorAssignments {
+	first: number;
+	private second;
+	constructor(first: number);
+}