diff --git a/extensions/markdown-language-features/src/preview/preview.ts b/extensions/markdown-language-features/src/preview/preview.ts
index a96a0ae028f..4dc949eae05 100644
--- a/extensions/markdown-language-features/src/preview/preview.ts
+++ b/extensions/markdown-language-features/src/preview/preview.ts
@@ -129,8 +129,9 @@ class MarkdownPreview extends Disposable implements WebviewResourceProvider {
 			const watcher = this._register(vscode.workspace.createFileSystemWatcher(new vscode.RelativePattern(resource, '*')));
 			this._register(watcher.onDidChange(uri => {
 				if (this.isPreviewOf(uri)) {
-					// Only use the file system event when VS Code does not already know about the file
-					if (!vscode.workspace.textDocuments.some(doc => doc.uri.toString() === uri.toString())) {
+					// Only use the file system event when VS Code does not already know about the file.
+					// This is needed to avoid duplicate refreshes
+					if (!vscode.workspace.textDocuments.some(doc => areUrisEqual(doc.uri, uri))) {
 						this.refresh();
 					}
 				}