diff --git a/libs/binder/IPCThreadState.cpp b/libs/binder/IPCThreadState.cpp
index 5ccf87f2c..5d34787d6 100644
--- a/libs/binder/IPCThreadState.cpp
+++ b/libs/binder/IPCThreadState.cpp
@@ -773,6 +773,7 @@ status_t IPCThreadState::talkWithDriver(bool doReceive)
         bwr.read_buffer = (long unsigned int)mIn.data();
     } else {
         bwr.read_size = 0;
+        bwr.read_buffer = 0;
     }
 
     IF_LOG_COMMANDS() {