diff --git a/src/components/rangeselector/get_update_object.js b/src/components/rangeselector/get_update_object.js
index 31f8e7d5eea..cfb2f0915c7 100644
--- a/src/components/rangeselector/get_update_object.js
+++ b/src/components/rangeselector/get_update_object.js
@@ -1,7 +1,7 @@
 'use strict';
 
 var d3Time = require('d3-time');
-var beginCap = require('../../lib').beginCap;
+var titleCase = require('../../lib').titleCase;
 
 module.exports = function getUpdateObject(axisLayout, buttonLayout) {
     var axName = axisLayout._name;
@@ -24,7 +24,7 @@ function getXRange(axisLayout, buttonLayout) {
     var base = new Date(axisLayout.r2l(currentRange[1]));
     var step = buttonLayout.step;
 
-    var utcStep = d3Time['utc' + beginCap(step)];
+    var utcStep = d3Time['utc' + titleCase(step)];
 
     var count = buttonLayout.count;
     var range0;
diff --git a/src/lib/index.js b/src/lib/index.js
index 7b43f2a0728..6fac1ef2552 100644
--- a/src/lib/index.js
+++ b/src/lib/index.js
@@ -1347,10 +1347,6 @@ lib.bigFont = function(size) {
     return Math.round(1.2 * size);
 };
 
-lib.beginCap = function(str) {
-    return str.charAt(0).toUpperCase() + str.slice(1);
-};
-
 var firefoxVersion = lib.getFirefoxVersion();
 // see https://bugzilla.mozilla.org/show_bug.cgi?id=1684973
 var isProblematicFirefox = firefoxVersion !== null && firefoxVersion < 86;
diff --git a/src/plots/geo/geo.js b/src/plots/geo/geo.js
index 2b7104f0616..2ee4aec5739 100644
--- a/src/plots/geo/geo.js
+++ b/src/plots/geo/geo.js
@@ -643,7 +643,7 @@ function getProjection(geoLayout) {
 
     var projName = constants.projNames[projType];
     // uppercase the first letter and add geo to the start of method name
-    projName = 'geo' + Lib.beginCap(projName);
+    projName = 'geo' + Lib.titleCase(projName);
     var projFn = geo[projName] || geoProjection[projName];
     var projection = projFn();