diff --git a/src/formio/components/checkbox.ts b/src/formio/components/checkbox.ts
index 5ee7dd1..342313a 100644
--- a/src/formio/components/checkbox.ts
+++ b/src/formio/components/checkbox.ts
@@ -13,5 +13,4 @@ export interface CheckboxComponentSchema
   extends Omit<CheckboxInputSchema, 'hideLabel' | 'disabled'> {
   type: 'checkbox';
   defaultValue: boolean;
-  multiple?: false;
 }
diff --git a/src/formio/components/selectboxes.ts b/src/formio/components/selectboxes.ts
index 4a25b46..8edf39b 100644
--- a/src/formio/components/selectboxes.ts
+++ b/src/formio/components/selectboxes.ts
@@ -18,7 +18,6 @@ export type SelectboxesInputSchema = InputComponentSchema<
 interface BaseSelectboxesSchema {
   type: 'selectboxes';
   defaultValue: Record<string, boolean>;
-  multiple?: false;
 }
 
 /**
diff --git a/test-d/formio/components/checkbox.test-d.ts b/test-d/formio/components/checkbox.test-d.ts
index 619f95e..11a1630 100644
--- a/test-d/formio/components/checkbox.test-d.ts
+++ b/test-d/formio/components/checkbox.test-d.ts
@@ -12,16 +12,6 @@ expectAssignable<CheckboxComponentSchema>({
 });
 
 
-// multiple false and appropriate default value type
-expectAssignable<CheckboxComponentSchema>({
-  id: 'yejak',
-  type: 'checkbox',
-  key: 'someCheckbox',
-  label: 'Some checkbox',
-  multiple: false,
-  defaultValue: true,
-});
-
 // full, correct schema
 expectAssignable<CheckboxComponentSchema>({
   id: 'yejak',
@@ -34,7 +24,6 @@ expectAssignable<CheckboxComponentSchema>({
   showInSummary: true,
   showInEmail: false,
   showInPDF: true,
-  multiple: false,
   hidden: false,
   clearOnHide: true,
   isSensitiveData: true,
@@ -66,13 +55,13 @@ expectAssignable<CheckboxComponentSchema>({
   validateOn: 'blur',
 });
 
-// multiple true not allowed
+// multiple not allowed
 expectNotAssignable<CheckboxComponentSchema>({
   id: 'yejak',
   type: 'checkbox',
   key: 'someCheckbox',
   label: 'Some checkbox',
-  multiple: true,
+  multiple: 'dummy',
 });
 
 // defaultValue not allowed
diff --git a/test-d/formio/components/selectboxes.test-d.ts b/test-d/formio/components/selectboxes.test-d.ts
index 2a0f29d..83a5f18 100644
--- a/test-d/formio/components/selectboxes.test-d.ts
+++ b/test-d/formio/components/selectboxes.test-d.ts
@@ -35,28 +35,12 @@ expectAssignable<SelectboxesComponentSchema>({
   },
 });
 
-// multiple false and appropriate default value type
-expectAssignable<SelectboxesComponentSchema>({
-  id: 'yejak',
-  type: 'selectboxes',
-  key: 'someSelectboxes',
-  label: 'Some selectboxes',
-  multiple: false,
-  defaultValue: {dummy: true},
-  openForms: {
-    dataSrc: 'variable',
-    itemsExpression: 'dummy',
-    translations: {},
-  },
-});
-
 // values translations
 expectAssignable<SelectboxesComponentSchema>({
   id: 'yejak',
   type: 'selectboxes',
   key: 'someSelectboxes',
   label: 'Some selectboxes',
-  multiple: false,
   defaultValue: {dummy: true},
   openForms: {
     dataSrc: 'manual',
@@ -92,7 +76,6 @@ expectAssignable<SelectboxesComponentSchema>({
   showInSummary: true,
   showInEmail: false,
   showInPDF: true,
-  multiple: false,
   hidden: false,
   clearOnHide: true,
   isSensitiveData: true,
@@ -134,13 +117,13 @@ expectNotAssignable<SelectboxesComponentSchema>({
   label: 'Some selectboxes',
 });
 
-// multiple true not allowed
+// multiple not allowed
 expectNotAssignable<SelectboxesComponentSchema>({
   id: 'yejak',
   type: 'selectboxes',
   key: 'someSelectboxes',
   label: 'Some selectboxes',
-  multiple: true,
+  multiple: 'dummy',
   openForms: {
     dataSrc: 'variable',
     itemsExpression: 'dummy',