diff --git a/src/dict/modify.c b/src/dict/modify.c
index 9d08bcc..75c511b 100644
--- a/src/dict/modify.c
+++ b/src/dict/modify.c
@@ -60,8 +60,8 @@ bool libcdsb_dict_update(dict_t* x, vtype_variable key, vtype_variable value, vo
 
     while (!is_null(c)) {
         if (vtype_compare(key.pointer, key.type, vnode_peek(&c->key, c->key_type), c->key_type) == 0) {
-            if (!callback) callback(libcdsb_variable_build(vnode_peek(&c->key,   c->key_type),   c->key_type),
-                                    libcdsb_variable_build(vnode_peek(&c->value, c->value_type), c->value_type), dt);
+            if (callback) callback(libcdsb_variable_build(vnode_peek(&c->key,   c->key_type),   c->key_type),
+                                   libcdsb_variable_build(vnode_peek(&c->value, c->value_type), c->value_type), dt);
 
             vnode_free(&c->value, c->value_type);
 
@@ -94,8 +94,8 @@ bool libcdsb_dict_inject(dict_t* x, vtype_variable key, vtype_variable value, vo
 
     while (!is_null(c)) {
         if (vtype_compare(key.pointer, key.type, vnode_peek(&c->key, c->key_type), c->key_type) == 0) {
-            if (!callback) callback(libcdsb_variable_build(vnode_peek(&c->key,   c->key_type),   c->key_type),
-                                    libcdsb_variable_build(vnode_peek(&c->value, c->value_type), c->value_type), dt);
+            if (callback) callback(libcdsb_variable_build(vnode_peek(&c->key,   c->key_type),   c->key_type),
+                                   libcdsb_variable_build(vnode_peek(&c->value, c->value_type), c->value_type), dt);
 
             vnode_free(&c->key,   c->key_type);
             vnode_free(&c->value, c->value_type);