diff --git a/packages/core/src/components/Form.tsx b/packages/core/src/components/Form.tsx
index 7e5dc64a33..2c0ea24e70 100644
--- a/packages/core/src/components/Form.tsx
+++ b/packages/core/src/components/Form.tsx
@@ -112,6 +112,11 @@ export interface FormProps<T = any, S extends StrictRJSFSchema = RJSFSchema, F e
   onFocus?: (id: string, data: any) => void;
   // <form /> HTML attributes
   /** The value of this prop will be passed to the `accept-charset` HTML attribute on the form */
+/** The value of this prop will be passed to the `accept-charset` HTML attribute on the form
+ * @deprecated replaced with `acceptCharset` which will supercede this value if both are specified
+ */
+  acceptcharset?: string;
+/** The value of this prop will be passed to the `accept-charset` HTML attribute on the form */
   acceptCharset?: string;
   /** The value of this prop will be passed to the `action` HTML attribute on the form
    *
@@ -870,6 +875,7 @@ export default class Form<
       action,
       autoComplete,
       enctype,
+      acceptcharset,
       acceptCharset,
       noHtml5Validate = false,
       disabled = false,
@@ -905,7 +911,7 @@ export default class Form<
         action={action}
         autoComplete={autoComplete}
         encType={enctype}
-        acceptCharset={acceptCharset}
+        acceptCharset={acceptCharset || acceptcharset}
         noValidate={noHtml5Validate}
         onSubmit={this.onSubmit}
         as={as}
diff --git a/packages/utils/src/constants.ts b/packages/utils/src/constants.ts
index 2768d08bad..eb542aa85b 100644
--- a/packages/utils/src/constants.ts
+++ b/packages/utils/src/constants.ts
@@ -23,6 +23,10 @@ export const PROPERTIES_KEY = 'properties';
 export const REQUIRED_KEY = 'required';
 export const SUBMIT_BTN_OPTIONS_KEY = 'submitButtonOptions';
 export const REF_KEY = '$ref';
+/**
+ * @deprecated Replace with correctly spelled constant `RJSF_ADDITIONAL_PROPERTIES_FLAG`
+ */
+export const RJSF_ADDITIONAL_PROPERTIES_FLAG = '__rjsf_additionalProperties';
 export const RJSF_ADDITIONAL_PROPERTIES_FLAG = '__rjsf_additionalProperties';
 export const ROOT_SCHEMA_PREFIX = '__rjsf_rootSchema';
 export const UI_FIELD_KEY = 'ui:field';