diff --git a/src/util/qpolygon-utils.js b/src/util/qpolygon-utils.js
index 32925a43..2b5c21e4 100644
--- a/src/util/qpolygon-utils.js
+++ b/src/util/qpolygon-utils.js
@@ -3857,7 +3857,7 @@ export const drawRidgeRoof = (roofId, canvas, textMode) => {
 
         const isBefore = edgesIntersection(checkBeforeEdge, ridgeEdge)
         if (isBefore) {
-          const size = Big(isBefore.x).minus(currentMidX).abs().pow(2).plus(Big(isBefore.y).minus(currentMidY).abs().pow(2)).sqrt().toNumber()
+          const size = Big(isBefore.x).minus(midX).abs().pow(2).plus(Big(isBefore.y).minus(midY).abs().pow(2)).sqrt().toNumber()
           ridgePoints.push({ x: isBefore.x, y: isBefore.y, size })
         }
       }
@@ -3883,7 +3883,7 @@ export const drawRidgeRoof = (roofId, canvas, textMode) => {
         }
         const isAfter = edgesIntersection(checkAfterEdge, ridgeEdge)
         if (isAfter) {
-          const size = Big(isAfter.x).minus(currentMidX).abs().pow(2).plus(Big(isAfter.y).minus(currentMidY).abs().pow(2)).sqrt().toNumber()
+          const size = Big(isAfter.x).minus(midX).abs().pow(2).plus(Big(isAfter.y).minus(midY).abs().pow(2)).sqrt().toNumber()
           ridgePoints.push({ x: isAfter.x, y: isAfter.y, size })
         }
       }
@@ -3993,7 +3993,7 @@ export const drawRidgeRoof = (roofId, canvas, textMode) => {
                 isOppPrev,
               )
             ) {
-              const size = Big(isOppPrev.x).minus(currentMidX).abs().pow(2).plus(Big(isOppPrev.y).minus(currentMidY).abs().pow(2)).sqrt().toNumber()
+              const size = Big(isOppPrev.x).minus(midX).abs().pow(2).plus(Big(isOppPrev.y).minus(midY).abs().pow(2)).sqrt().toNumber()
               ridgePoints.push({ x: isOppPrev.x, y: isOppPrev.y, size })
             }
           }
@@ -4034,7 +4034,7 @@ export const drawRidgeRoof = (roofId, canvas, textMode) => {
                 isOppNext,
               )
             ) {
-              const size = Big(isOppNext.x).minus(currentMidX).abs().pow(2).plus(Big(isOppNext.y).minus(currentMidY).abs().pow(2)).sqrt().toNumber()
+              const size = Big(isOppNext.x).minus(midx).abs().pow(2).plus(Big(isOppNext.y).minus(midY).abs().pow(2)).sqrt().toNumber()
               ridgePoints.push({ x: isOppNext.x, y: isOppNext.y, size })
             }
           }