diff --git a/mpp/base/mpp_buf_slot.cpp b/mpp/base/mpp_buf_slot.cpp
index e1a3434b..aecdc0a3 100644
--- a/mpp/base/mpp_buf_slot.cpp
+++ b/mpp/base/mpp_buf_slot.cpp
@@ -259,7 +259,7 @@ static RK_S32 get_afbc_min_size(RK_S32 width, RK_S32 height, RK_S32 bpp)
     /* AFBC_FORMAT_MOD_BLOCK_SIZE_16x16 and !AFBC_FORMAT_MOD_TILED */
     width = MPP_ALIGN(width, 16);
     /* NOTE: Add extra 16 line for deblock output */
-    height = MPP_ALIGN(height, 16) + 16;
+    height = MPP_ALIGN(height, 16);
     hdr_alignment = AFBC_HDR_ALIGN;
 
     n_blocks = (width * height) / AFBC_SUPERBLOCK_PIXELS;