diff --git a/firmware/target/arm/i2s-pp.c b/firmware/target/arm/i2s-pp.c
index 1485147de8..af698fddd6 100644
--- a/firmware/target/arm/i2s-pp.c
+++ b/firmware/target/arm/i2s-pp.c
@@ -62,7 +62,7 @@ void i2s_reset(void)
 /* Other formats not yet known */
 
 /* Are we I2S Master or slave? */
-#define I2S_MASTER (0x25)
+#define I2S_MASTER (1<<25)
 
 #define I2S_RESET (0x1 << 31)