diff --git a/media/libaudiohal/EffectHalHidl.cpp b/media/libaudiohal/EffectHalHidl.cpp
index b49b975..48d3a32 100644
--- a/media/libaudiohal/EffectHalHidl.cpp
+++ b/media/libaudiohal/EffectHalHidl.cpp
@@ -49,6 +49,9 @@
         mEffect.clear();
         hardware::IPCThreadState::self()->flushCommands();
     }
+    if (mEfGroup) {
+        EventFlag::deleteEventFlag(&mEfGroup);
+    }
 }
 
 // static