diff --git a/.changeset/silver-horses-return.md b/.changeset/silver-horses-return.md
new file mode 100644
index 000000000..fe73aaf3b
--- /dev/null
+++ b/.changeset/silver-horses-return.md
@@ -0,0 +1,5 @@
+---
+'@lion/overlays': patch
+---
+
+Prevent `opened-changed` event to be sent twice
diff --git a/packages/overlays/src/OverlayMixin.js b/packages/overlays/src/OverlayMixin.js
index 6cf57b475..20aacc5b7 100644
--- a/packages/overlays/src/OverlayMixin.js
+++ b/packages/overlays/src/OverlayMixin.js
@@ -62,7 +62,7 @@ export const OverlayMixinImplementation = superclass =>
      */
     requestUpdateInternal(name, oldValue) {
       super.requestUpdateInternal(name, oldValue);
-      if (name === 'opened') {
+      if (name === 'opened' && this.opened !== oldValue) {
         this.dispatchEvent(new Event('opened-changed'));
       }
     }
diff --git a/packages/overlays/test-suites/OverlayMixin.suite.js b/packages/overlays/test-suites/OverlayMixin.suite.js
index bc8f63038..446bf456e 100644
--- a/packages/overlays/test-suites/OverlayMixin.suite.js
+++ b/packages/overlays/test-suites/OverlayMixin.suite.js
@@ -132,6 +132,9 @@ export function runOverlayMixinSuite({ tagString, tag, suffix = '' }) {
       await el.updateComplete;
       expect(spy.callCount).to.equal(1);
       expect(el.opened).to.be.true;
+      el.opened = true;
+      await el.updateComplete;
+      expect(spy.callCount).to.equal(1);
       await el._overlayCtrl.hide();
       await el.updateComplete;
       expect(spy.callCount).to.equal(2);