diff --git a/src/rios/core/validation/form.py b/src/rios/core/validation/form.py
index fa166d2..f7d41f4 100644
--- a/src/rios/core/validation/form.py
+++ b/src/rios/core/validation/form.py
@@ -646,6 +646,7 @@ def _check_fields_covered(self, node, cstruct):
             field['id']
             for field in self.instrument['record']
         ])
+        hide_disable_targets = set()
 
         form_fields = set()
         for pidx, page in enumerate(cstruct['pages']):
@@ -666,6 +667,12 @@ def _check_fields_covered(self, node, cstruct):
                             )
                         form_fields.add(field_id)
 
+                    for event in element['options'].get('events', []):
+                        if event['action'] in ('hide', 'disable'):
+                            hide_disable_targets.update(
+                                event.get('targets', [field_id])
+                            )
+
         missing = instrument_fields - form_fields
         if missing:
             raise ValidationError(
@@ -684,6 +691,21 @@ def _check_fields_covered(self, node, cstruct):
                 )
             )
 
+        required_fields = set([
+            field['id']
+            for field in self.instrument['record']
+            if field.get('required', False)
+        ])
+        hidden_required_fields = required_fields & hide_disable_targets
+        if hidden_required_fields:
+            raise ValidationError(
+                node,
+                'There are required fields targetted by hide/disable events:'
+                ' %s' % (
+                    ', '.join(sorted(hidden_required_fields)),
+                )
+            )
+
     def _get_instrument_field_type(self, name, record=None):
         record = record or self.instrument['record']
         for field in record:
diff --git a/tests/test_form_validation.py b/tests/test_form_validation.py
index 1168a16..6a1ff2c 100644
--- a/tests/test_form_validation.py
+++ b/tests/test_form_validation.py
@@ -418,3 +418,28 @@ def test_wrong_standard_widget():
     else:
         assert False
 
+
+def test_hiding_required_field_top_top():
+    instrument = deepcopy(INSTRUMENT)
+    instrument['record'][1]['required'] = True
+    validator = Form(instrument=instrument)
+    form = deepcopy(FORM)
+    form['pages'][1]['elements'][0]['options']['events'] = [{
+        'trigger': 'true()',
+        'action': 'hide',
+        'targets': ['boolean_field'],
+    }]
+    form['pages'][0]['elements'][5]['options']['events'] = [{
+        'trigger': 'true()',
+        'action': 'disable',
+    }]
+    try:
+        validator.deserialize(form)
+    except ValidationError as exc:
+        assert_validation_error(
+            exc,
+            {'': u'There are required fields targetted by hide/disable events: boolean_field, text_field'},
+        )
+    else:
+        assert False
+