diff --git a/src/interpolate/splineMonotone.js b/src/interpolate/splineMonotone.js
index 535dc2c8..dfebd21b 100644
--- a/src/interpolate/splineMonotone.js
+++ b/src/interpolate/splineMonotone.js
@@ -62,7 +62,7 @@ const interpolator = (arr, yp, s) => {
 	};
 };
 
-const interpolatorSplineMonotone2 = arr => {
+const interpolatorSplineMonotone = arr => {
 	if (arr.length < 3) {
 		return interpolatorLinear(arr);
 	}
@@ -82,7 +82,7 @@ const interpolatorSplineMonotone2 = arr => {
 	linear interpolation.
  */
 
-const interpolatorSplineMonotone = arr => {
+const interpolatorSplineMonotone2 = arr => {
 	if (arr.length < 3) {
 		return interpolatorLinear(arr);
 	}
diff --git a/test/interpolateSplineMonotone.test.js b/test/interpolateSplineMonotone.test.js
index 60fb22f1..4462fe11 100644
--- a/test/interpolateSplineMonotone.test.js
+++ b/test/interpolateSplineMonotone.test.js
@@ -11,15 +11,15 @@ tape('interpolatorSplineMonotone', t => {
 	let data = [3, 2.8, 2.5, 1, 0.95, 0.8, 0.5, 0.1, 0.05];
 	t.deepEqual(samples(10).map(interpolatorSplineMonotone(data)), [
 		3,
-		2.82716049382716,
+		2.826611796982167,
 		2.6089163237311386,
 		1.3592592592592596,
 		0.973593964334705,
 		0.8984224965706447,
 		0.7148148148148149,
 		0.40631001371742104,
-		0.08950617283950621,
-		0.04999999999999999
+		0.09005486968449936,
+		0.049999999999999975
 	]);
 	t.end();
 });
@@ -28,15 +28,15 @@ tape('interpolatorSplineMonotone2', t => {
 	let data = [3, 2.8, 2.5, 1, 0.95, 0.8, 0.5, 0.1, 0.05];
 	t.deepEqual(samples(10).map(interpolatorSplineMonotone2(data)), [
 		3,
-		2.826611796982167,
+		2.82716049382716,
 		2.6089163237311386,
 		1.3592592592592596,
 		0.973593964334705,
 		0.8984224965706447,
 		0.7148148148148149,
 		0.40631001371742104,
-		0.09005486968449936,
-		0.049999999999999975
+		0.08950617283950621,
+		0.04999999999999999
 	]);
 	t.end();
 });