VBA & Macro Problems

Fix Excel Error: Procedure Declaration Does Not Match Event

Huma Ashraf Ch Sep 25, 2026 869 views

Question details

The user needs to resolve a VBA compile error that occurs when an Excel workbook opens, caused by an improperly declared event procedure.

Fix Excel Error: Procedure Declaration Does Not Match Event

Product: Microsoft Excel
Device & OS: not provided
Scenario: Opening an Excel workbook that contains a Workbook_Open event macro.
Observed behavior: Excel displays a compile error stating 'Procedure declaration does not match description of event or procedure having the same name' because the Workbook_Open event includes an invalid Target argument.

Before you start

Click OK to close the error dialog, and ensure you save a backup of your macro-enabled workbook (.xlsm) before modifying the VBA code to prevent accidental data loss.

Solution 1Recommended

Correct the Workbook_Open Event Declaration

Fix the compile error by removing the invalid Target argument, ensuring the Workbook_Open event signature strictly matches Excel's predefined structure.

Excel's built-in event handlers require specific, predefined declarations. The Workbook_Open event does not accept any arguments. Passing an argument like 'Target' to it violates this structure and triggers the compile error.

Open the Visual Basic Editor

Press the Alt + F11 shortcut keys in Excel to launch the Visual Basic for Applications (VBA) Editor.

Locate the ThisWorkbook Module

In the Project Explorer pane on the left side of the window, find your current workbook project and double-click on 'ThisWorkbook' to view its code.

Remove the Target Argument

Locate the Workbook_Open subroutine. Change the declaration from something like 'Private Sub Workbook_Open(ByVal Target As Range)' to exactly 'Private Sub Workbook_Open()'.

Reposition Data-Validation Code

Ensure that any restoration code or data-validation logic remains safely inside the body of this newly corrected procedure, then click the Save icon.

Correct the Workbook_Open Event Declaration

Verification: Close the VBA Editor, save the workbook, and reopen the file. The macro should now run seamlessly without triggering the procedure declaration error.

Edit and Run VBA Macros Easily with WPS Spreadsheets

WPS Spreadsheets provides an integrated, familiar Visual Basic Editor environment, allowing you to troubleshoot and write VBA macros seamlessly while ensuring high compatibility with Excel event procedures.

1. Open your Workbook in WPS: Launch WPS Office and open your macro-enabled spreadsheet.
2. Access Developer Tools: Click on the 'Developer' tab located in the top ribbon menu.
3. Open the VBA Editor: Click the 'Visual Basic' icon or press Alt + F11 to access the code editor and manage your event procedures like Workbook_Open.

Fully compatible with Microsoft Excel macro-enabled formats (.xlsm, .xlsb)Familiar Visual Basic Editor interface for quick code troubleshootingLightweight application that processes large macro workbooks quicklyBuilt-in Developer tab for immediate access to automation tools

microsoft office alternative - wps office

Frequently Asked Questions

Why does the 'Procedure declaration does not match event' error occur?

This error happens when you add, remove, or modify arguments (parameters) in a built-in Excel VBA event macro. Built-in events, like Workbook_Open or Worksheet_Change, have strict, predefined signatures that must exactly match Excel's expectations to function correctly.

Does the Workbook_Open event accept a Target argument?

No, the Workbook_Open event does not accept any arguments. If you need to reference a specific cell or range when the workbook opens, you must define that range directly within the body of the VBA procedure rather than passing it as an argument.

How can I automatically generate the correct event signature in VBA?

In the VBA Editor code window, select your object (e.g., 'Workbook') from the top-left dropdown menu, and then select the desired event (e.g., 'Open') from the top-right dropdown. The VBA editor will automatically insert the correctly formatted, error-free procedure declaration.

Excel & Data Problems