diff --git a/phpBB/assets/javascript/core.js b/phpBB/assets/javascript/core.js
index 785aa141f0..02fb3ed08d 100644
--- a/phpBB/assets/javascript/core.js
+++ b/phpBB/assets/javascript/core.js
@@ -1301,6 +1301,20 @@ phpbb.toggleDropdown = function() {
 
 		if (direction == 'left') {
 			options.dropdown.css('margin-left', '-' + freeSpace + 'px');
+
+			// Try to position the notification dropdown correctly in RTL-responsive mode
+			if (options.dropdown.hasClass('dropdown-extended')) {
+				var contentWidth,
+					fullFreeSpace = freeSpace + parent.outerWidth();
+
+				options.dropdown.find('.dropdown-contents').each(function() {
+					contentWidth = parseInt($(this).outerWidth());
+					$(this).css({marginLeft: 0, left: 0});
+				});
+
+				var maxOffset = Math.min(contentWidth, fullFreeSpace) + 'px';
+				options.dropdown.css({'width': maxOffset, 'margin-left': '-' + maxOffset});
+			}
 		} else {
 			options.dropdown.css('margin-right', '-' + (windowWidth + freeSpace) + 'px');
 		}
diff --git a/phpBB/styles/prosilver/theme/common.css b/phpBB/styles/prosilver/theme/common.css
index 1d8bd6f3df..c94bd7d017 100644
--- a/phpBB/styles/prosilver/theme/common.css
+++ b/phpBB/styles/prosilver/theme/common.css
@@ -1147,9 +1147,9 @@ form > p.post-notice strong {
 
 .dropdown-extended .dropdown-contents {
 	max-height: none;
-	max-width: 340px !important;
 	padding: 0;
 	position: absolute;
+	width: 340px;
 }
 
 .dropdown-extended .header {
diff --git a/phpBB/styles/prosilver/theme/responsive.css b/phpBB/styles/prosilver/theme/responsive.css
index d921da62fb..82c23d8770 100644
--- a/phpBB/styles/prosilver/theme/responsive.css
+++ b/phpBB/styles/prosilver/theme/responsive.css
@@ -191,7 +191,7 @@ ul.topiclist li.row dt a.subforum {
 @media only screen and (max-width: 350px), only screen and (max-device-width: 350px)
 {
 	.dropdown-extended .dropdown-contents {
-		max-width: 300px !important;
+		width: auto;
 	}
 }