1 files changed, 1 insertions, 1 deletions

diff --git a/firmware/export/i2c.h b/firmware/export/i2c.h
index ed9a5e678d..ba694d0d3a 100644
--- a/firmware/export/i2c.h
+++ b/firmware/export/i2c.h
@@ -22,7 +22,7 @@
 extern void i2c_init(void);
 extern void i2c_begin(void);
 extern void i2c_end(void);
-extern int i2c_write(int device, unsigned char* buf, int count );
+extern int i2c_write(int device, const unsigned char* buf, int count );
 extern int i2c_read(int device, unsigned char* buf, int count );
 extern int i2c_readmem(int device, int address, unsigned char* buf, int count );
 extern void i2c_outb(unsigned char byte);