diff --git a/django/contrib/admin/static/admin/js/inlines.js b/django/contrib/admin/static/admin/js/inlines.js
index 82ec02723705..b9658a64d270 100644
--- a/django/contrib/admin/static/admin/js/inlines.js
+++ b/django/contrib/admin/static/admin/js/inlines.js
@@ -301,6 +301,13 @@
                     dependencies = [];
                 $.each(dependency_list, function(i, field_name) {
                     dependencies.push('#' + row.find('.form-row .field-' + field_name).find('input, select, textarea').attr('id'));
+                    // Dependency in a fieldset.
+                    let field_element = row.find('.form-row .field-' + field_name);
+                    // Dependency without a fieldset.
+                    if (!field_element.length) {
+                        field_element = row.find('.form-row.field-' + field_name);
+                    }
+                    dependencies.push('#' + field_element.find('input, select, textarea').attr('id'));
                 });
                 if (dependencies.length) {
                     input.prepopulate(dependencies, input.attr('maxlength'));