1 files changed, 2 insertions, 2 deletions

diff --git a/firmware/drivers/mas.c b/firmware/drivers/mas.c
index c39a46c9f2..a6fd1d1a21 100644
--- a/firmware/drivers/mas.c
+++ b/firmware/drivers/mas.c
@@ -112,12 +112,12 @@ int mas_readmem(int bank, int addr, unsigned long* dest, int len)
 }
 
 /* note: 'len' is number of 32-bit words, not number of bytes! */
-int mas_writemem(int bank, int addr, unsigned long* src, int len)
+int mas_writemem(int bank, int addr, const unsigned long* src, int len)
 {
     int ret = 0;
     int i, j;
     unsigned char buf[60];
-    unsigned char* ptr = (unsigned char*)src;
+    const unsigned char* ptr = (const unsigned char*)src;
 
     i2c_begin();