diff --git a/src/main.ts b/src/main.ts
index 80e9726f..100ccb30 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -8,6 +8,7 @@ import {
 	TextEditor,
 	Uri,
 	commands,
+	extensions,
 	languages,
 	window,
 	workspace,
@@ -42,6 +43,18 @@ export async function activate(context: ExtensionContext) {
 	const outputChannel = window.createOutputChannel("Biome");
 	const traceOutputChannel = window.createOutputChannel("Biome Trace");
 
+	// If this extension is a stable version and a nightly version is installed
+	// and active, we abort activation of the stable version.
+	if (context.extension.id === "biomejs.biome") {
+		const nightlyExtension = extensions.getExtension("biomejs.biome-nightly");
+		if (nightlyExtension?.isActive) {
+			outputChannel.appendLine(
+				"Biome Nightly detected, disabling Biome extension",
+			);
+			return;
+		}
+	}
+
 	const requiresConfiguration = workspace
 		.getConfiguration("biome")
 		.get<boolean>("requireConfiguration");