diff --git a/internal/provider/resource_collection.go b/internal/provider/resource_collection.go
index b59ee2f..213537a 100644
--- a/internal/provider/resource_collection.go
+++ b/internal/provider/resource_collection.go
@@ -86,7 +86,7 @@ func (r *CollectionResource) Schema(ctx context.Context, req resource.SchemaRequ
 			},
 		},
 		Blocks: map[string]schema.Block{
-			"fields": schema.ListNestedBlock{
+			"fields": schema.SetNestedBlock{
 				NestedObject: schema.NestedBlockObject{
 					Attributes: map[string]schema.Attribute{
 						"name": schema.StringAttribute{