diff --git a/netbox/utilities/forms/bulk_import.py b/netbox/utilities/forms/bulk_import.py
index 63cec2ba2..57362d3dd 100644
--- a/netbox/utilities/forms/bulk_import.py
+++ b/netbox/utilities/forms/bulk_import.py
@@ -129,6 +129,7 @@ class BulkImportForm(BootstrapMixin, SyncedDataMixin, forms.Form):
         headers, records = parse_csv(reader)
 
         # Set CSV headers for reference by the model form
+        headers.pop('id', None)
         self._csv_headers = headers
 
         return records
diff --git a/netbox/utilities/forms/forms.py b/netbox/utilities/forms/forms.py
index 04d956a49..54c9e41cb 100644
--- a/netbox/utilities/forms/forms.py
+++ b/netbox/utilities/forms/forms.py
@@ -70,22 +70,24 @@ class CSVModelForm(forms.ModelForm):
     """
     ModelForm used for the import of objects in CSV format.
     """
-    def __init__(self, *args, headers=None, fields=None, **kwargs):
-        headers = headers or {}
-        fields = fields or []
+    def __init__(self, *args, headers=None, **kwargs):
+        self.headers = headers or {}
         super().__init__(*args, **kwargs)
 
         # Modify the model form to accommodate any customized to_field_name properties
-        for field, to_field in headers.items():
+        for field, to_field in self.headers.items():
             if to_field is not None:
                 self.fields[field].to_field_name = to_field
 
-        # Omit any fields not specified (e.g. because the form is being used to
-        # updated rather than create objects)
-        if fields:
-            for field in list(self.fields.keys()):
-                if field not in fields:
-                    del self.fields[field]
+    def clean(self):
+        # Flag any invalid CSV headers
+        for header in self.headers:
+            if header not in self.fields:
+                raise forms.ValidationError(
+                    _("Unrecognized header: {name}").format(name=header)
+                )
+
+        return super().clean()
 
 
 class FilterForm(BootstrapMixin, forms.Form):