diff --git a/arch/arm/boot/dts/mt7986-spim-nand-partition.dtsi b/arch/arm/boot/dts/mt7986-spim-nand-partition.dtsi
index 4cc7961..924f8cc 100644
--- a/arch/arm/boot/dts/mt7986-spim-nand-partition.dtsi
+++ b/arch/arm/boot/dts/mt7986-spim-nand-partition.dtsi
@@ -36,7 +36,7 @@
 
 			partition@580000 {
 				label = "ubi";
-				reg = <0x580000 0x4000000>;
+				reg = <0x580000 0xFA80000>;
 			};
 		};
 	};
diff --git a/arch/arm64/boot/dts/mediatek/mt7986-spim-nand-partition.dtsi b/arch/arm64/boot/dts/mediatek/mt7986-spim-nand-partition.dtsi
index 4cc7961..924f8cc 100644
--- a/arch/arm64/boot/dts/mediatek/mt7986-spim-nand-partition.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7986-spim-nand-partition.dtsi
@@ -36,7 +36,7 @@
 
 			partition@580000 {
 				label = "ubi";
-				reg = <0x580000 0x4000000>;
+				reg = <0x580000 0xFA80000>;
 			};
 		};
 	};