diff --git a/btrbk b/btrbk
index 6cecf11..6dbd79b 100755
--- a/btrbk
+++ b/btrbk
@@ -3768,7 +3768,10 @@ sub check_file($$;@)
     die("accept_type must contain either 'relative' or 'absolute'");
   }
 
-  # check directory traversal
+  if($file =~ /\n/) {
+    ERROR "Unsupported newline in file ${error_statement}: " . ($file =~ s/\n/\\n/gr) if(defined($error_statement));
+    return undef;
+  }
   if(($file =~ /^\.\.$/) || ($file =~ /^\.\.\//) || ($file =~ /\/\.\.\//) || ($file =~ /\/\.\.$/)) {
     ERROR "Illegal directory traversal ${error_statement}: $file" if(defined($error_statement));
     return undef;