diff --git a/phpBB/styles/prosilver/theme/tweaks.css b/phpBB/styles/prosilver/theme/tweaks.css
index 05ad1fa926c..287d3943ff6 100644
--- a/phpBB/styles/prosilver/theme/tweaks.css
+++ b/phpBB/styles/prosilver/theme/tweaks.css
@@ -77,7 +77,7 @@ dd.option {
 
 /* IE8 often can't handle max-width in %, so we use px instead */
 .postprofile .avatar img {
-	max-width: 150px; 
+	max-width: 150px\9;
 }
 
 /* Border-radius bleed fix in IE9 */