diff --git a/src/Avatar.js b/src/Avatar.js
index 76f5e55ff0..c0127d49af 100644
--- a/src/Avatar.js
+++ b/src/Avatar.js
@@ -22,8 +22,8 @@ module.exports = {
     avatarUrlForMember: function(member, width, height, resizeMethod) {
         var url = member.getAvatarUrl(
             MatrixClientPeg.get().getHomeserverUrl(),
-            width,
-            height,
+            Math.floor(width * window.devicePixelRatio),
+            Math.floor(height * window.devicePixelRatio),
             resizeMethod,
             false,
             false
@@ -40,7 +40,9 @@ module.exports = {
     avatarUrlForUser: function(user, width, height, resizeMethod) {
         var url = ContentRepo.getHttpUriForMxc(
             MatrixClientPeg.get().getHomeserverUrl(), user.avatarUrl,
-            width, height, resizeMethod
+            Math.floor(width * window.devicePixelRatio),
+            Math.floor(height * window.devicePixelRatio),
+            resizeMethod
         );
         if (!url || url.length === 0) {
             return null;
@@ -57,4 +59,3 @@ module.exports = {
         return 'img/' + images[total % images.length] + '.png';
     }
 };
-
diff --git a/src/components/views/avatars/RoomAvatar.js b/src/components/views/avatars/RoomAvatar.js
index bfa7575b0c..8041fd5cd7 100644
--- a/src/components/views/avatars/RoomAvatar.js
+++ b/src/components/views/avatars/RoomAvatar.js
@@ -59,7 +59,9 @@ module.exports = React.createClass({
             ContentRepo.getHttpUriForMxc(
                 MatrixClientPeg.get().getHomeserverUrl(),
                 props.oobData.avatarUrl,
-                props.width, props.height, props.resizeMethod
+                Math.floor(props.width * window.devicePixelRatio),
+                Math.floor(props.height * window.devicePixelRatio),
+                props.resizeMethod
             ), // highest priority
             this.getRoomAvatarUrl(props),
             this.getOneToOneAvatar(props),
@@ -74,7 +76,9 @@ module.exports = React.createClass({
 
         return props.room.getAvatarUrl(
             MatrixClientPeg.get().getHomeserverUrl(),
-            props.width, props.height, props.resizeMethod,
+            Math.floor(props.width * window.devicePixelRatio),
+            Math.floor(props.height * window.devicePixelRatio),
+            props.resizeMethod,
             false
         );
     },
@@ -103,14 +107,18 @@ module.exports = React.createClass({
             }
             return theOtherGuy.getAvatarUrl(
                 MatrixClientPeg.get().getHomeserverUrl(),
-                props.width, props.height, props.resizeMethod,
+                Math.floor(props.width * window.devicePixelRatio),
+                Math.floor(props.height * window.devicePixelRatio),
+                props.resizeMethod,
                 false
             );
         } else if (userIds.length == 1) {
             return mlist[userIds[0]].getAvatarUrl(
                 MatrixClientPeg.get().getHomeserverUrl(),
-                props.width, props.height, props.resizeMethod,
-                    false
+                Math.floor(props.width * window.devicePixelRatio),
+                Math.floor(props.height * window.devicePixelRatio),
+                props.resizeMethod,
+                false
             );
         } else {
            return null;