diff --git a/target/linux/ramips/mt7621/config-5.10 b/target/linux/ramips/mt7621/config-5.10
index f3bf6fbb2babdbad75d5e6f2c1077da18c177a33..8a5e778e7eb36eadc32f7210c54c723bdbb080be 100644
--- a/target/linux/ramips/mt7621/config-5.10
+++ b/target/linux/ramips/mt7621/config-5.10
@@ -96,6 +96,7 @@ CONFIG_HAS_IOPORT_MAP=y
 CONFIG_HIGHMEM=y
 CONFIG_I2C=y
 CONFIG_I2C_BOARDINFO=y
+CONFIG_I2C_CHARDEV=y
 CONFIG_I2C_GPIO=y
 CONFIG_I2C_MT7621=y
 CONFIG_INITRAMFS_SOURCE=""