diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 584b2d04b2d7..6bbee733afca 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -33,7 +33,7 @@ struct scatterlist;
 #define IO_TLB_SIZE (1 << IO_TLB_SHIFT)
 
 /* Umber Increase: default to 2048MB (instead of 64MB) */
-#define IO_TLB_DEFAULT_SIZE (2048UL<<20)
+#define IO_TLB_DEFAULT_SIZE (1024UL<<20)
 
 unsigned long swiotlb_size_or_default(void);
 void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,