diff --git a/packages/nodes-base/nodes/ActiveCampaign/ActiveCampaign.node.ts b/packages/nodes-base/nodes/ActiveCampaign/ActiveCampaign.node.ts
index f8a610463f..e6efe97457 100644
--- a/packages/nodes-base/nodes/ActiveCampaign/ActiveCampaign.node.ts
+++ b/packages/nodes-base/nodes/ActiveCampaign/ActiveCampaign.node.ts
@@ -202,6 +202,39 @@ export class ActiveCampaign implements INodeType {
 						default: '',
 						description: 'Phone number of the contact.',
 					},
+					{
+						displayName: 'Custom Properties',
+						name: 'customProperties',
+						placeholder: 'Add Custom Property',
+						description: 'Adds a custom property to set also values which have not been predefined.',
+						type: 'fixedCollection',
+						typeOptions: {
+							multipleValues: true,
+						},
+						default: {},
+						options: [
+							{
+								name: 'property',
+								displayName: 'Property',
+								values: [
+									{
+										displayName: 'Property Name',
+										name: 'name',
+										type: 'string',
+										default: '',
+										description: 'Name of the property to set.',
+									},
+									{
+										displayName: 'Property Value',
+										name: 'value',
+										type: 'string',
+										default: '',
+										description: 'Value of the property to set.',
+									},
+								]
+							},
+						],
+					},
 				],
 			},
 
@@ -361,6 +394,39 @@ export class ActiveCampaign implements INodeType {
 						default: '',
 						description: 'Phone number of the contact.',
 					},
+					{
+						displayName: 'Custom Properties',
+						name: 'customProperties',
+						placeholder: 'Add Custom Property',
+						description: 'Adds a custom property to set also values which have not been predefined.',
+						type: 'fixedCollection',
+						typeOptions: {
+							multipleValues: true,
+						},
+						default: {},
+						options: [
+							{
+								name: 'property',
+								displayName: 'Property',
+								values: [
+									{
+										displayName: 'Property Name',
+										name: 'name',
+										type: 'string',
+										default: '',
+										description: 'Name of the property to set.',
+									},
+									{
+										displayName: 'Property Value',
+										name: 'value',
+										type: 'string',
+										default: '',
+										description: 'Value of the property to set.',
+									},
+								]
+							},
+						],
+					},
 				],
 			},