diff --git a/client/dcwebui.js b/client/dcwebui.js
index ef9fdf0..7e99de5 100644
--- a/client/dcwebui.js
+++ b/client/dcwebui.js
@@ -698,9 +698,16 @@ var scrollback_move = function(delta) {
 	}
 	
 	if (chat_scrollback_index === -1) {
-		chat_scrollback_index = (delta === 1) ? 0 : chat_scrollback.length - 1;
+		chat_scrollback_index = chat_scrollback.length - 1; // always starts at most recent message
 	} else {
-		chat_scrollback_index = negmod(chat_scrollback_index + delta, chat_scrollback.length);
+		chat_scrollback_index += delta;
+		
+		// clamp
+		if (chat_scrollback_index === -1) {
+			chat_scrollback_index = 0;
+		} else if (chat_scrollback_index === chat_scrollback.length) {
+			chat_scrollback_index = chat_scrollback.length - 1;
+		}
 	}
 	
 	$("#chatbox").value = chat_scrollback[chat_scrollback_index];