diff --git a/build/boards/sg200x/sg2002_licheervnano_sd/memmap.py b/build/boards/sg200x/sg2002_licheervnano_sd/memmap.py
index 678edf174..4c676f060 100755
--- a/build/boards/sg200x/sg2002_licheervnano_sd/memmap.py
+++ b/build/boards/sg200x/sg2002_licheervnano_sd/memmap.py
@@ -40,7 +40,7 @@ class MemoryMap:
     # =================
     # Multimedia buffer. Used by u-boot/kernel/FreeRTOS
     # =================
-    ION_SIZE = 105 * SIZE_1M
+    ION_SIZE = 75 * SIZE_1M
     H26X_BITSTREAM_SIZE = 2 * SIZE_1M
     H26X_ENC_BUFF_SIZE = 0
     ISP_MEM_BASE_SIZE = 20 * SIZE_1M