diff --git a/src.ts/providers/infura-provider.ts b/src.ts/providers/infura-provider.ts
index 0eebe0c3..55c433cb 100644
--- a/src.ts/providers/infura-provider.ts
+++ b/src.ts/providers/infura-provider.ts
@@ -53,6 +53,7 @@ export class InfuraProvider extends JsonRpcProvider {
 
         // Legacy API Access Token
         } else {
+            errors.warn("The legacy INFURA apiAccesToken API is deprecated; please upgrade to a Project ID instead (see INFURA dshboard; https://infura.io)");
             super('https://' + host + '/' + projectId, standard);
             defineReadOnly(this, 'apiAccessToken', projectId);
             defineReadOnly(this, 'projectId', null);