diff --git a/src/components/floor-plan/modal/auxiliary/AuxiliarySize.jsx b/src/components/floor-plan/modal/auxiliary/AuxiliarySize.jsx
index 40fb9f76..6b0abda1 100644
--- a/src/components/floor-plan/modal/auxiliary/AuxiliarySize.jsx
+++ b/src/components/floor-plan/modal/auxiliary/AuxiliarySize.jsx
@@ -84,12 +84,12 @@ export default function AuxiliarySize(props) {
 
         //1지점 선택일때는 2지점의 좌표, 2지점 선택일때는 1지점의 좌표를 조정한다.
         if (checkedRadio === 1) {
-          const newX2 = Big(x1).plus(dx.times(scaleFactor))
-          const newY2 = Big(y1).plus(dy.times(scaleFactor))
+          const newX2 = Big(x1).plus(dx.times(scaleFactor)).toNumber()
+          const newY2 = Big(y1).plus(dy.times(scaleFactor)).toNumber()
           currentObject.set({ x2: newX2, y2: newY2 })
         } else if (checkedRadio === 2) {
-          const newX1 = Big(x2).minus(dx.times(scaleFactor))
-          const newY1 = Big(y2).minus(dy.times(scaleFactor))
+          const newX1 = Big(x2).minus(dx.times(scaleFactor)).toNumber()
+          const newY1 = Big(y2).minus(dy.times(scaleFactor)).toNumber()
           currentObject.set({ x1: newX1, y1: newY1 })
         }
         //planeSize와 actualSize를 재계산한다.