diff --git a/src/service/viewport-impl.js b/src/service/viewport-impl.js
index 7608da10f050..c514b541c414 100644
--- a/src/service/viewport-impl.js
+++ b/src/service/viewport-impl.js
@@ -1110,7 +1110,7 @@ export class ViewportBindingNaturalIosEmbed_ {
     // This code will no longer be needed with the newer iOS viewport
     // implementation.
     onDocumentReady(this.win.document, doc => {
-      doc.body.style.borderStyle = lightboxMode ? 'none' : 'solid';
+      doc.body.style.borderTopStyle = lightboxMode ? 'none' : 'solid';
     });
   }
 
diff --git a/test/functional/test-viewport.js b/test/functional/test-viewport.js
index 61e75ac647c0..7e06588cd11b 100644
--- a/test/functional/test-viewport.js
+++ b/test/functional/test-viewport.js
@@ -1126,10 +1126,15 @@ describe('ViewportBindingNaturalIosEmbed', () => {
     expect(windowApi.document.body.style.borderTopStyle).to.be.undefined;
 
     binding.updateLightboxMode(true);
-    expect(windowApi.document.body.style.borderStyle).to.equal('none');
+    expect(windowApi.document.body.style.borderTopStyle).to.equal('none');
 
     binding.updateLightboxMode(false);
-    expect(windowApi.document.body.style.borderStyle).to.equal('solid');
+    expect(windowApi.document.body.style.borderTopStyle).to.equal('solid');
+    expect(windowApi.document.body.style.borderBottomStyle).to.not.equal(
+        'solid');
+    expect(windowApi.document.body.style.borderLeftStyle).to.not.equal('solid');
+    expect(windowApi.document.body.style.borderRightStyle).to.not.equal(
+        'solid');
   });
 
   it('should calculate size', () => {