diff --git a/lib/atmosphere.js b/lib/atmosphere.js
index 4afdd40..30d7f7d 100644
--- a/lib/atmosphere.js
+++ b/lib/atmosphere.js
@@ -194,7 +194,7 @@ function a(i: number): number {
         1.7,
         1.1,
         0
-    ].map(function(a) {return a === 0 ? a : (a / 1000);});/* eslint-enable no-magic-numbers */
+    ].map(a => a === 0 ? a : (a / 1000));/* eslint-enable no-magic-numbers */
     return lapseRates[i];
 }
 /**
diff --git a/lib/geodetic.js b/lib/geodetic.js
index a8e4b7e..2478feb 100644
--- a/lib/geodetic.js
+++ b/lib/geodetic.js
@@ -257,7 +257,7 @@ function toDegreesMinutesSeconds(value: point3): ?number[] {
         return null;
     }
     const data = value;
-    const dimension = data.length - data.slice(0).reverse().findIndex(function(val) {return abs(val) > 0;});
+    const dimension = data.length - data.slice(0).reverse().findIndex(val => abs(val) > 0);
     const degrees = trunc(value[0]);
     let minutes = 0;
     let seconds = 0;