diff --git a/libgralloc/alloc_controller.cpp b/libgralloc/alloc_controller.cpp
index 94ca3d4..4daadb6 100644
--- a/libgralloc/alloc_controller.cpp
+++ b/libgralloc/alloc_controller.cpp
@@ -315,7 +315,7 @@
         case HAL_PIXEL_FORMAT_YCbCr_420_SP:
         case HAL_PIXEL_FORMAT_YCrCb_420_SP:
             alignedh = height;
-            size = ALIGN((alignedw*alignedh) + (alignedw* alignedh)/2, 4096);
+            size = ALIGN((alignedw*alignedh) + (alignedw* alignedh)/2 + 1, 4096);
             break;
         case HAL_PIXEL_FORMAT_YCbCr_422_SP:
         case HAL_PIXEL_FORMAT_YCrCb_422_SP: