diff --git a/include/surfaceflinger/Surface.h b/include/surfaceflinger/Surface.h
index d783caf..9e0b5bb 100644
--- a/include/surfaceflinger/Surface.h
+++ b/include/surfaceflinger/Surface.h
@@ -242,6 +242,10 @@
     status_t validate(bool inCancelBuffer = false) const;
     sp<ISurface> getISurface() const;
 
+    // When the buffer pool is a fixed size we want to make sure SurfaceFlinger
+    // won't stall clients, so we require an extra buffer.
+    enum { MIN_UNDEQUEUED_BUFFERS = 2 };
+
     inline const GraphicBufferMapper& getBufferMapper() const { return mBufferMapper; }
     inline GraphicBufferMapper& getBufferMapper() { return mBufferMapper; }