diff --git a/src/ext/sse.js b/src/ext/sse.js
index 75c875a17..dcba333f8 100644
--- a/src/ext/sse.js
+++ b/src/ext/sse.js
@@ -135,6 +135,13 @@ This extension adds support for Server Sent Events to htmx.  See /www/extensions
 		var source = htmx.createEventSource(sseURL);
 		internalData.sseEventSource = source;
 
+		// Don't forget to disconnect the EventSource on page unload
+		window.addEventListener("beforeunload", function () {
+			if (source != undefined) {
+				source.close();
+			}
+		});
+
 		// Create event handlers
 		source.onerror = function (err) {