diff --git a/lib/ace/ext/error_marker.js b/lib/ace/ext/error_marker.js
index 05d50498..5dbe3d2e 100644
--- a/lib/ace/ext/error_marker.js
+++ b/lib/ace/ext/error_marker.js
@@ -62,7 +62,7 @@ function findAnnotations(session, row, dir) {
     if (i < 0)
         i = -i - 1;
     
-    if (i >= annotations.length - 1)
+    if (i >= annotations.length)
         i = dir > 0 ? 0 : annotations.length - 1;
     else if (i === 0 && dir < 0)
         i = annotations.length - 1;