diff --git a/server/camlistored/ui/index.js b/server/camlistored/ui/index.js
index d1ad32840..a98b73074 100644
--- a/server/camlistored/ui/index.js
+++ b/server/camlistored/ui/index.js
@@ -721,11 +721,11 @@ cam.IndexPage = React.createClass({
 			fileName = goog.string.subs('/%s', rm.file.fileName);
 		}
 
-		var downloadUrl = goog.string.subs('%s/%s%s', this.props.config.downloadHelper, rm.blobRef, fileName);
+		var downloadUrl = goog.string.subs('%s%s%s', this.props.config.downloadHelper, rm.blobRef, fileName);
 		return React.DOM.button(
 			{
 				key:'viewSelection',
-				onClick: this.handleOpenWindow_.bind(null, this, downloadUrl),
+				onClick: this.handleOpenWindow_.bind(null, downloadUrl),
 			},
 			'View original'
 		);