diff --git a/package-lock.json b/package-lock.json
index 720bf20f..0c65257c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1909,7 +1909,6 @@
       "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
       "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
       "dev": true,
-      "optional": true,
       "requires": {
         "kind-of": "^3.0.2",
         "longest": "^1.0.1",
@@ -10991,7 +10990,6 @@
               "version": "2.2.4",
               "bundled": true,
               "dev": true,
-              "optional": true,
               "requires": {
                 "safe-buffer": "^5.1.1",
                 "yallist": "^3.0.0"
@@ -11010,7 +11008,6 @@
               "version": "0.5.1",
               "bundled": true,
               "dev": true,
-              "optional": true,
               "requires": {
                 "minimist": "0.0.8"
               }
@@ -11104,7 +11101,6 @@
               "version": "1.4.0",
               "bundled": true,
               "dev": true,
-              "optional": true,
               "requires": {
                 "wrappy": "1"
               }
@@ -11190,8 +11186,7 @@
             "safe-buffer": {
               "version": "5.1.1",
               "bundled": true,
-              "dev": true,
-              "optional": true
+              "dev": true
             },
             "safer-buffer": {
               "version": "2.1.2",
@@ -11297,8 +11292,7 @@
             "yallist": {
               "version": "3.0.2",
               "bundled": true,
-              "dev": true,
-              "optional": true
+              "dev": true
             }
           }
         },
@@ -12074,8 +12068,7 @@
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/longest/-/longest-1.0.1.tgz",
       "integrity": "sha1-MKCy2jj3N3DoKUoNIuZiXtd9AJc=",
-      "dev": true,
-      "optional": true
+      "dev": true
     },
     "loose-envify": {
       "version": "1.3.1",
@@ -20028,7 +20021,6 @@
               "version": "0.5.1",
               "bundled": true,
               "dev": true,
-              "optional": true,
               "requires": {
                 "minimist": "0.0.8"
               }
diff --git a/src/ol-ext/format.js b/src/ol-ext/format.js
index d4f0327a..abddbfd0 100644
--- a/src/ol-ext/format.js
+++ b/src/ol-ext/format.js
@@ -6,6 +6,8 @@ import { EPSG_4326 } from './consts'
 import { createCircularPolygon } from './geom'
 import { transformPoint } from './proj'
 import { isCircle } from './util'
+import LineString from 'ol/geom/LineString'
+import { getLength } from 'ol/sphere'
 
 /**
  * @param {Object} [options]
@@ -34,13 +36,16 @@ export function createMvtFmt (options) {
 class GeoJSON extends BaseGeoJSON {
   writeGeometryObject (geometry, options) {
     if (isCircle(geometry)) {
+      const start = geometry.getCenter()
+      const end = [start[0] + geometry.getRadius(), start[1]]
+      const radius = getLength(new LineString([start, end]), options.featureProjection || this.defaultFeatureProjection)
       geometry = createCircularPolygon(
         transformPoint(
           geometry.getCenter(),
           options.featureProjection || this.defaultFeatureProjection,
           EPSG_4326,
         ),
-        geometry.getRadius(),
+        radius
       )
       options.featureProjection = EPSG_4326
     }