diff --git a/source/import/importerply.js b/source/import/importerply.js
index 5230f08..5c966a0 100644
--- a/source/import/importerply.js
+++ b/source/import/importerply.js
@@ -269,20 +269,15 @@ OV.ImporterPly = class extends OV.ImporterBase
 
         function GetMaterialFromColor (obj, color, colorToMaterial)
         {
-            function IntegerToHex (intVal)
-            {
-                let result = parseInt (intVal, 10).toString (16);
-                while (result.length < 2) {
-                    result = '0' + result;
-                }
-                return result;
-            }
-
             if (color === null) {
                 return null;
             }
 
-            let materialName = 'Color ' + IntegerToHex (color[0]) + IntegerToHex (color[1]) + IntegerToHex (color[2]) + IntegerToHex (color[3]);
+            let materialName = 'Color ' +
+                OV.IntegerToHexString (color[0]) +
+                OV.IntegerToHexString (color[1]) +
+                OV.IntegerToHexString (color[2]) +
+                OV.IntegerToHexString (color[3]);
             let materialIndex = colorToMaterial[materialName];
             if (materialIndex === undefined) {
                 let material = new OV.Material ();
diff --git a/source/model/material.js b/source/model/material.js
index cd8fd78..18bc941 100644
--- a/source/model/material.js
+++ b/source/model/material.js
@@ -162,20 +162,20 @@ OV.LinearToSRGB = function (component)
     }
 };
 
+OV.IntegerToHexString = function (intVal)
+{
+    let result = parseInt (intVal, 10).toString (16);
+    while (result.length < 2) {
+        result = '0' + result;
+    }
+    return result;
+};
+
 OV.ColorToHexString = function (color)
 {
-    function IntegerToHex (intVal)
-    {
-        let result = parseInt (intVal, 10).toString (16);
-        while (result.length < 2) {
-            result = '0' + result;
-        }
-        return result;
-    }
-
-    let r = IntegerToHex (color.r);
-    let g = IntegerToHex (color.g);
-    let b = IntegerToHex (color.b);
+    let r = OV.IntegerToHexString (color.r);
+    let g = OV.IntegerToHexString (color.g);
+    let b = OV.IntegerToHexString (color.b);
     return r + g + b;
 };