diff --git a/luprex/core/cpp/drivenengine.cpp b/luprex/core/cpp/drivenengine.cpp
index 69426444..907a5736 100644
--- a/luprex/core/cpp/drivenengine.cpp
+++ b/luprex/core/cpp/drivenengine.cpp
@@ -196,7 +196,7 @@ const std::string &DrivenEngine::drv_get_target(int chid) {
 bool DrivenEngine::drv_outgoing_empty(int chid) {
     int nbytes; const char *bytes;
     drv_peek_outgoing(chid, &nbytes, &bytes);
-    return (nbytes > 0);
+    return (nbytes == 0);
 }
 
 bool DrivenEngine::drv_get_channel_released(int chid) {