diff --git a/measure.go b/measure.go
index bd8afc33..f1a25fef 100644
--- a/measure.go
+++ b/measure.go
@@ -45,8 +45,8 @@ func newMeasure(v specsp) *measure {
 		size:         size,
 		text:         text,
 		color:        color.RGBA{R: r, G: g, B: b, A: 0xff},
-		x:            v["center_x"].(float64),
-		y:            v["center_y"].(float64),
+		x:            v["x"].(float64),
+		y:            v["y"].(float64),
 		svgLineStyle: fmt.Sprintf("stroke-width:%d;stroke:rgb(%d, %d, %d);", measureLineWidth, r, g, b),
 		svgRotate:    fmt.Sprintf("rotate(%.1f %d %d)", heading, svgSize>>1, svgSize>>1),
 		svgSize:      svgSize,
diff --git a/test/Measure/res/index.json b/test/Measure/res/index.json
index b779b754..7c1c059a 100644
--- a/test/Measure/res/index.json
+++ b/test/Measure/res/index.json
@@ -18,32 +18,32 @@
     },
     {
       "type": "measure",
-      "center_x": 0,
-      "center_y": 0,
+      "x": 0,
+      "y": 0,
       "heading": 0,
       "size": 150,
       "color": 15629590
     },
     {
       "type": "measure",
-      "center_x": -100,
-      "center_y": 0,
+      "x": -100,
+      "y": 0,
       "heading": 60,
       "size": 200,
       "color": 0
     },
     {
       "type": "measure",
-      "center_x": -100,
-      "center_y": 100,
+      "x": -100,
+      "y": 100,
       "heading": -30,
       "size": 100,
       "color": 65535
     },
     {
       "type": "measure",
-      "center_x": 0,
-      "center_y": 100,
+      "x": 0,
+      "y": 100,
       "heading": 90,
       "size": 10,
       "scale": 10,