diff --git a/conf/cf-lex.l b/conf/cf-lex.l
index 9ea05e9d..05288b1a 100644
--- a/conf/cf-lex.l
+++ b/conf/cf-lex.l
@@ -737,7 +737,7 @@ cf_lex_init(int is_cli, struct config *c)
 void
 cf_push_scope(struct symbol *sym)
 {
-  struct sym_scope *s = cfg_alloc(sizeof(struct sym_scope));
+  struct sym_scope *s = cfg_allocz(sizeof(struct sym_scope));
 
   s->next = conf_this_scope;
   conf_this_scope = s;
diff --git a/conf/confbase.Y b/conf/confbase.Y
index f0343a93..67dcac6c 100644
--- a/conf/confbase.Y
+++ b/conf/confbase.Y
@@ -148,7 +148,7 @@ conf: definition ;
 
 definition:
    DEFINE symbol '=' term ';' {
-     struct f_val *val = cfg_alloc(sizeof(struct f_val));
+     struct f_val *val = cfg_allocz(sizeof(struct f_val));
      if (f_eval(f_linearize($4), cfg_mem, val) > F_RETURN) cf_error("Runtime error");
      cf_define_symbol($2, SYM_CONSTANT | val->type, val, val);
    }
diff --git a/filter/tree.c b/filter/tree.c
index 46d6e529..2bbc84bb 100644
--- a/filter/tree.c
+++ b/filter/tree.c
@@ -103,12 +103,7 @@ build_tree(struct f_tree *from)
 struct f_tree *
 f_new_tree(void)
 {
-  struct f_tree * ret;
-  ret = cfg_alloc(sizeof(struct f_tree));
-  ret->left = ret->right = NULL;
-  ret->from.type = ret->to.type = T_VOID;
-  ret->from.val.i = ret->to.val.i = 0;
-  ret->data = NULL;
+  struct f_tree *ret = cfg_allocz(sizeof(struct f_tree));
   return ret;
 }
 
diff --git a/nest/config.Y b/nest/config.Y
index 83f2c7ba..ec7217b0 100644
--- a/nest/config.Y
+++ b/nest/config.Y
@@ -479,11 +479,11 @@ password_item:
 password_item_begin:
    PASSWORD text {
      if (!this_p_list) {
-	this_p_list = cfg_alloc(sizeof(list));
+	this_p_list = cfg_allocz(sizeof(list));
 	init_list(this_p_list);
 	password_id = 1;
      }
-     this_p_item = cfg_alloc(sizeof (struct password_item));
+     this_p_item = cfg_allocz(sizeof(struct password_item));
      this_p_item->password = $2;
      this_p_item->length = strlen($2);
      this_p_item->genfrom = 0;