diff --git a/libs/gui/BufferItemConsumer.cpp b/libs/gui/BufferItemConsumer.cpp
index fdfd15e..5079883 100644
--- a/libs/gui/BufferItemConsumer.cpp
+++ b/libs/gui/BufferItemConsumer.cpp
@@ -82,7 +82,7 @@
 
     Mutex::Autolock _l(mMutex);
 
-    err = addReleaseFence(item.mBuf, releaseFence);
+    err = addReleaseFenceLocked(item.mBuf, releaseFence);
 
     err = releaseBufferLocked(item.mBuf, EGL_NO_DISPLAY,
             EGL_NO_SYNC_KHR);
diff --git a/libs/gui/ConsumerBase.cpp b/libs/gui/ConsumerBase.cpp
index f5d6ff0..624d7e0 100644
--- a/libs/gui/ConsumerBase.cpp
+++ b/libs/gui/ConsumerBase.cpp
@@ -193,7 +193,12 @@
 }
 
 status_t ConsumerBase::addReleaseFence(int slot, const sp<Fence>& fence) {
-    CB_LOGV("addReleaseFence: slot=%d", slot);
+    Mutex::Autolock lock(mMutex);
+    return addReleaseFenceLocked(slot, fence);
+}
+
+status_t ConsumerBase::addReleaseFenceLocked(int slot, const sp<Fence>& fence) {
+    CB_LOGV("addReleaseFenceLocked: slot=%d", slot);
 
     if (!mSlots[slot].mFence.get()) {
         mSlots[slot].mFence = fence;
diff --git a/libs/gui/SurfaceTexture.cpp b/libs/gui/SurfaceTexture.cpp
index 57bcd2c..b4dfb5e 100644
--- a/libs/gui/SurfaceTexture.cpp
+++ b/libs/gui/SurfaceTexture.cpp
@@ -484,7 +484,7 @@
                 return UNKNOWN_ERROR;
             }
             sp<Fence> fence(new Fence(fenceFd));
-            status_t err = addReleaseFence(mCurrentTexture, fence);
+            status_t err = addReleaseFenceLocked(mCurrentTexture, fence);
             if (err != OK) {
                 ST_LOGE("syncForReleaseLocked: error adding release fence: "
                         "%s (%d)", strerror(-err), err);