diff --git a/Sources/Apollo/ApolloInterceptor.swift b/Sources/Apollo/ApolloInterceptor.swift
index 1d6c06445..81b36c676 100644
--- a/Sources/Apollo/ApolloInterceptor.swift
+++ b/Sources/Apollo/ApolloInterceptor.swift
@@ -10,7 +10,7 @@ public protocol ApolloInterceptor {
   /// Each operation request has it's own interceptor request chain so the interceptors do not
   /// need to be uniquely identifiable between each and every request, only unique between the
   /// list of interceptors in a single request.
-  var id: String { get set }
+  var id: String { get }
   
   /// Called when this interceptor should do its work.
   ///