diff --git a/drivers/serial/sh-sci.h b/drivers/serial/sh-sci.h
index c0f4823..3599828 100644
--- a/drivers/serial/sh-sci.h
+++ b/drivers/serial/sh-sci.h
@@ -395,6 +395,7 @@
 SCIx_FNS(SCxTDR, 0x20,  8, 0x0c,  8)
 SCIx_FNS(SCxSR,  0x14, 16, 0x10, 16)
 SCIx_FNS(SCxRDR, 0x24,  8, 0x14,  8)
+SCIx_FNS(SCSPTR, 0,     0,    0,  0)
 SCIF_FNS(SCTDSR, 0x0c,  8)
 SCIF_FNS(SCFER,  0x10, 16)
 SCIF_FNS(SCFCR,  0x18, 16)