diff --git a/include/asm-mips/mach-au1x00/au1xxx_psc.h b/include/asm-mips/mach-au1x00/au1xxx_psc.h
index d7cbacdd21fe57107b9dc925dae5526010bf7c32..1bd4e27caf6b70ee4ecbc1b2df29846e124e9969 100644
--- a/include/asm-mips/mach-au1x00/au1xxx_psc.h
+++ b/include/asm-mips/mach-au1x00/au1xxx_psc.h
@@ -512,7 +512,7 @@ typedef struct	psc_smb {
 
 /* Transmit register control.
 */
-#define PSC_SMBTXRX_RSR		(1 << 30)
+#define PSC_SMBTXRX_RSR		(1 << 28)
 #define PSC_SMBTXRX_STP		(1 << 29)
 #define PSC_SMBTXRX_DATAMASK	(0xff)