diff --git a/du6/program.c b/du6/program.c
index 6bdae7b..bef5c6d 100644
--- a/du6/program.c
+++ b/du6/program.c
@@ -47,9 +47,9 @@ bool find_the_incorrect(struct tree* tree) {
     if (tree == NULL)
         return false;
 
-    if (tree->value &&
-       (strcspn(tree->value, "*") != strlen(tree->value) &&
-        strcspn(tree->value, "?") != strlen(tree->value))) {
+    if 
+       ((strcspn(tree->value, "*") != strlen(tree->value) &&
+        strcspn(tree->value, "?") != strlen(tree->value)) || (strcspn(tree->value, ".") != strlen(tree->value)  )) {
         return true;
     }