diff --git a/lib/loadObj.js b/lib/loadObj.js
index 963a6d8..a26ba07 100644
--- a/lib/loadObj.js
+++ b/lib/loadObj.js
@@ -107,6 +107,11 @@ function loadObj(objPath, options) {
 
     var vertexIndices = [];
 
+    function clearVertexCache() {
+        vertexCache = {};
+        vertexCacheCount = 0;
+    }
+
     function getName(name) {
         return (name === '' ? undefined : name);
     }
@@ -130,8 +135,7 @@ function loadObj(objPath, options) {
         mesh.primitives.push(primitive);
 
         // Clear the vertex cache for each new primitive
-        vertexCache = {};
-        vertexCacheCount = 0;
+        clearVertexCache();
         vertexCount = 0;
     }
 
@@ -143,6 +147,7 @@ function loadObj(objPath, options) {
         for (var i = 0; i < primitivesLength; ++i) {
             if (primitives[i].material === material) {
                 primitive = primitives[i];
+                clearVertexCache();
                 vertexCount = primitive.positions.length / 3;
                 return;
             }
@@ -205,8 +210,7 @@ function loadObj(objPath, options) {
             // may be some duplicate vertices.
             vertexCacheCount++;
             if (vertexCacheCount > vertexCacheLimit) {
-                vertexCacheCount = 0;
-                vertexCache = {};
+                clearVertexCache();
             }
         }
         return index;