diff --git a/deform/field.py b/deform/field.py
index 750ab635..1d584ede 100644
--- a/deform/field.py
+++ b/deform/field.py
@@ -183,11 +183,15 @@ def __init__(
         appstruct=colander.null,
         parent=None,
         autofocus=None,
-        **kw
+        **kw,
     ):
         self.counter = counter or itertools.count()
         self.order = next(self.counter)
-        self.oid = getattr(schema, "oid", "deformField%s" % self.order)
+        if parent is not None:
+            parent = weakref.ref(parent)
+        self._parent = parent
+        oid_prefix = getattr(self.get_root(), "formid", "deform")
+        self.oid = getattr(schema, "oid", f"{oid_prefix}Field{self.order}")
         self.schema = schema
         self.typ = schema.typ  # required by Invalid exception
         self.name = schema.name
@@ -222,9 +226,6 @@ def __init__(
 
         self.resource_registry = resource_registry
         self.children = []
-        if parent is not None:
-            parent = weakref.ref(parent)
-        self._parent = parent
         self.__dict__.update(kw)
 
         first_input_index = -1
@@ -254,7 +255,7 @@ def __init__(
                     resource_registry=resource_registry,
                     parent=self,
                     autofocus=autofocus,
-                    **kw
+                    **kw,
                 )
             )
             child_count += 1
diff --git a/deform/form.py b/deform/form.py
index 684b1905..d27321e6 100644
--- a/deform/form.py
+++ b/deform/form.py
@@ -139,6 +139,7 @@ def __init__(
         # Use kwargs to pass flags to descendant fields; saves cluttering
         # the constructor
         kw["focus"] = self.focus
+        self.formid = formid
         field.Field.__init__(self, schema, **kw)
         _buttons = []
         for button in buttons:
@@ -148,7 +149,6 @@ def __init__(
         self.action = action
         self.method = method
         self.buttons = _buttons
-        self.formid = formid
         self.use_ajax = use_ajax
         self.ajax_options = Markup(ajax_options.strip())
         form_widget = getattr(schema, "widget", None)
diff --git a/deform/tests/test_form.py b/deform/tests/test_form.py
index b7e0b35d..e2173a69 100644
--- a/deform/tests/test_form.py
+++ b/deform/tests/test_form.py
@@ -162,6 +162,27 @@ def test_issue_71(self):
             1,
         )
 
+    def test_oid_inherits_formid(self):
+        # See https://github.com/Pylons/deform/issues/394
+
+        # Pyramid
+        import colander
+
+        # Deform
+        import deform
+
+        class FooForm(colander.Schema):
+            foo_field = colander.SchemaNode(colander.String())
+
+        class BarForm(colander.Schema):
+            bar_field = colander.SchemaNode(colander.String())
+
+        foo_form = deform.Form(FooForm(), formid="fooForm")
+        bar_form = deform.Form(BarForm(), formid="barForm")
+        self.assertNotEqual(
+            foo_form["foo_field"].oid, bar_form["bar_field"].oid
+        )
+
 
 class TestButton(unittest.TestCase):
     def _makeOne(self, **kw):