diff --git a/packages/ckeditor5-ckfinder/src/ckfindercommand.js b/packages/ckeditor5-ckfinder/src/ckfindercommand.js
index f1650e6a61a..d7fb683c292 100644
--- a/packages/ckeditor5-ckfinder/src/ckfindercommand.js
+++ b/packages/ckeditor5-ckfinder/src/ckfindercommand.js
@@ -33,6 +33,9 @@ export default class CKFinderCommand extends Command {
 	constructor( editor ) {
 		super( editor );
 
+		// The CKFinder command does not affect data by itself.
+		this._affectsData = false;
+
 		// Remove default document listener to lower its priority.
 		this.stopListening( this.editor.model.document, 'change' );
 
diff --git a/packages/ckeditor5-ckfinder/tests/ckfindercommand.js b/packages/ckeditor5-ckfinder/tests/ckfindercommand.js
index 64936018489..abcb9f35388 100644
--- a/packages/ckeditor5-ckfinder/tests/ckfindercommand.js
+++ b/packages/ckeditor5-ckfinder/tests/ckfindercommand.js
@@ -455,4 +455,10 @@ describe( 'CKFinderCommand', () => {
 			mockFinderEvent( 'files:choose', data );
 		}
 	} );
+
+	describe( '_affectsData', () => {
+		it( 'does not affect data', () => {
+			expect( command._affectsData ).to.be.false;
+		} );
+	} );
 } );