diff --git a/libs/ui/SharedBufferStack.cpp b/libs/ui/SharedBufferStack.cpp
index 47c596c..b460757 100644
--- a/libs/ui/SharedBufferStack.cpp
+++ b/libs/ui/SharedBufferStack.cpp
@@ -97,10 +97,10 @@
 // ----------------------------------------------------------------------------
 
 SharedBufferBase::SharedBufferBase(SharedClient* sharedClient,
-        int surface, int num)
+        int surface, int num, int32_t identity)
     : mSharedClient(sharedClient), 
       mSharedStack(sharedClient->surfaces + surface),
-      mNumBuffers(num)
+      mNumBuffers(num), mIdentity(identity)
 {
 }
 
@@ -248,8 +248,8 @@
 // ============================================================================
 
 SharedBufferClient::SharedBufferClient(SharedClient* sharedClient,
-        int surface, int num)
-    : SharedBufferBase(sharedClient, surface, num), tail(0)
+        int surface, int num, int32_t identity)
+    : SharedBufferBase(sharedClient, surface, num, identity), tail(0)
 {
     tail = computeTail();
 }
@@ -353,7 +353,7 @@
 
 SharedBufferServer::SharedBufferServer(SharedClient* sharedClient,
         int surface, int num, int32_t identity)
-    : SharedBufferBase(sharedClient, surface, num)
+    : SharedBufferBase(sharedClient, surface, num, identity)
 {
     mSharedStack->init(identity);
     mSharedStack->head = num-1;