diff --git a/media/codec2/sfplugin/CCodec.cpp b/media/codec2/sfplugin/CCodec.cpp
index 86fd8ab..e737006 100644
--- a/media/codec2/sfplugin/CCodec.cpp
+++ b/media/codec2/sfplugin/CCodec.cpp
@@ -2311,9 +2311,12 @@
 void CCodec::onWorkDone(std::list<std::unique_ptr<C2Work>> &workItems) {
     if (!workItems.empty()) {
         Mutexed<std::list<std::unique_ptr<C2Work>>>::Locked queue(mWorkDoneQueue);
+        bool shouldPost = queue->empty();
         queue->splice(queue->end(), workItems);
+        if (shouldPost) {
+            (new AMessage(kWhatWorkDone, this))->post();
+        }
     }
-    (new AMessage(kWhatWorkDone, this))->post();
 }
 
 void CCodec::onInputBufferDone(uint64_t frameIndex, size_t arrayIndex) {