diff --git a/install/calculate b/install/calculate
index 00fb347..bfa98a8 100755
--- a/install/calculate
+++ b/install/calculate
@@ -3329,7 +3329,7 @@ sub extract_exec{
 				$bar = 0;
 			}
 			my $res = copy_with_progress($install_from,$data{mount},$count);
-			if($install_from == "/mnt/squashfs"){
+			if($install_from eq "/mnt/squashfs"){
 				system "$data{path} umount $install_from && rmdir $install_from";
 			}
 			return $res;