diff --git a/lib/http-invocation.js b/lib/http-invocation.js
index 0839dcfd..c9125fc2 100644
--- a/lib/http-invocation.js
+++ b/lib/http-invocation.js
@@ -146,7 +146,12 @@ HttpInvocation.prototype._processArg = function(req, verb, query, accept) {
     // default to query string for GET
     if (val !== undefined) {
       query = query || {};
-      query[name] = val;
+      if ((accept.type === 'object' || accept.type === 'string') &&
+        typeof val === 'object') {
+        query[name] = JSON.stringify(val);
+      } else {
+        query[name] = val;
+      }
     }
   } else {
     // default to storing args on the body for !GET