diff --git a/scripts/compare_intervals_exact.pl b/scripts/compare_intervals_exact.pl
old mode 100644
new mode 100755
index e86c017..7b736ba
--- a/scripts/compare_intervals_exact.pl
+++ b/scripts/compare_intervals_exact.pl
@@ -362,7 +362,7 @@ sub RemoveOverlapping
 		while( $i < $size_aa && $j < $size_bb )
 		{
 			# i.R < j.L
-			if ( $aa->{$key}[$i][1] < $bb->{$key}[$j][1] )
+			if ( $aa->{$key}[$i][1] < $bb->{$key}[$j][0] )
 			{
 				$i += 1;
 				next;