diff --git a/include/private/surfaceflinger/SharedBufferStack.h b/include/private/surfaceflinger/SharedBufferStack.h
index 0c5a2e4..c3ac317 100644
--- a/include/private/surfaceflinger/SharedBufferStack.h
+++ b/include/private/surfaceflinger/SharedBufferStack.h
@@ -80,6 +80,7 @@
     // file need to be updated.
     static const unsigned int NUM_LAYERS_MAX  = 31;
     static const unsigned int NUM_BUFFER_MAX  = 16;
+    static const unsigned int NUM_BUFFER_MIN  = 2;
     static const unsigned int NUM_DISPLAY_MAX = 4;
 
     struct Statistics { // 4 longs