diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 204e819..fdef98b 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -4446,7 +4446,7 @@
         // If we do not take the dstChain lock, it is possible that processing is ongoing
         // while we are starting the effect.  This can cause glitches with volume,
         // see b/202360137.
-        dstChain->lock();
+        dstChain->mutex().lock();
         for (const auto& effect : removed) {
             if (effect->state() == IAfEffectModule::ACTIVE ||
                     effect->state() == IAfEffectModule::STOPPING) {
@@ -4454,7 +4454,7 @@
                 effect->start();
             }
         }
-        dstChain->unlock();
+        dstChain->mutex().unlock();
     }
 
     if (status != NO_ERROR) {