diff --git a/arch/sh/configs/rts7751r2d1_defconfig b/arch/sh/configs/rts7751r2d1_defconfig
index fba1f62d56e74..dba024d72a894 100644
--- a/arch/sh/configs/rts7751r2d1_defconfig
+++ b/arch/sh/configs/rts7751r2d1_defconfig
@@ -877,7 +877,7 @@ CONFIG_SERIAL_8250_RUNTIME_UARTS=4
 #
 # CONFIG_SERIAL_MAX3100 is not set
 CONFIG_SERIAL_SH_SCI=y
-CONFIG_SERIAL_SH_SCI_NR_UARTS=1
+CONFIG_SERIAL_SH_SCI_NR_UARTS=2
 CONFIG_SERIAL_SH_SCI_CONSOLE=y
 CONFIG_SERIAL_CORE=y
 CONFIG_SERIAL_CORE_CONSOLE=y
diff --git a/arch/sh/configs/rts7751r2dplus_defconfig b/arch/sh/configs/rts7751r2dplus_defconfig
index a8d538f06e677..6d511d06cbf6c 100644
--- a/arch/sh/configs/rts7751r2dplus_defconfig
+++ b/arch/sh/configs/rts7751r2dplus_defconfig
@@ -963,7 +963,7 @@ CONFIG_SERIAL_8250_RUNTIME_UARTS=4
 #
 # CONFIG_SERIAL_MAX3100 is not set
 CONFIG_SERIAL_SH_SCI=y
-CONFIG_SERIAL_SH_SCI_NR_UARTS=1
+CONFIG_SERIAL_SH_SCI_NR_UARTS=2
 CONFIG_SERIAL_SH_SCI_CONSOLE=y
 CONFIG_SERIAL_CORE=y
 CONFIG_SERIAL_CORE_CONSOLE=y