diff --git a/armsrc/BigBuf.h b/armsrc/BigBuf.h
index 61239d7d7..e8c6f5cd4 100644
--- a/armsrc/BigBuf.h
+++ b/armsrc/BigBuf.h
@@ -23,7 +23,7 @@
 #define MAX_MIFARE_FRAME_SIZE	18		// biggest Mifare frame is answer to a read (one block = 16 Bytes) + 2 Bytes CRC
 #define MAX_MIFARE_PARITY_SIZE	3		// need 18 parity bits for the 18 Byte above. 3 Bytes are enough to store these
 #define CARD_MEMORY_SIZE		4096	
-#define DMA_BUFFER_SIZE    		128
+#define DMA_BUFFER_SIZE    		256 	//128  (how big is the dma?!?
 
 extern uint8_t *BigBuf_get_addr(void);
 extern uint8_t *BigBuf_get_EM_addr(void);