diff --git a/benchmarks/msgq/1.0/IBenchmarkMsgQ.hal b/benchmarks/msgq/1.0/IBenchmarkMsgQ.hal
index 234865e..a3ed72b 100644
--- a/benchmarks/msgq/1.0/IBenchmarkMsgQ.hal
+++ b/benchmarks/msgq/1.0/IBenchmarkMsgQ.hal
@@ -17,27 +17,8 @@
 package android.hardware.benchmarks.msgq@1.0;
 
 interface IBenchmarkMsgQ {
-
-  struct shm_t {
-    uint32_t fdIndex;
-    uint32_t offset;
-    uint32_t extent;
-  };
-  struct WireGrantorDescriptor {
-    uint32_t flags;
-    shm_t shm;
-  };
-
-  struct WireMQDescriptor {
-    vec<WireGrantorDescriptor> grantors;
-    handle mq_handle;
-    uint32_t quantum;
-    uint32_t nQuanta;
-    uint32_t flags;
-  };
-
-  ConfigureClientInbox() generates ( WireMQDescriptor mq_desc_in );
-  ConfigureClientOutbox() generates ( WireMQDescriptor mq_desc_out );
+  ConfigureClientInbox() generates (int32_t ret, MQDescriptor mq_desc_in );
+  ConfigureClientOutbox() generates ( int32_t ret, MQDescriptor mq_desc_out );
   RequestWrite (int32_t count) generates (int32_t ret);
   RequestRead(int32_t count) generates (int32_t ret);
   BenchmarkPingPong(uint32_t numIter);