diff --git a/components/nifbullet/bulletnifloader.cpp b/components/nifbullet/bulletnifloader.cpp
index a7afabf8f..be5a7d9d6 100644
--- a/components/nifbullet/bulletnifloader.cpp
+++ b/components/nifbullet/bulletnifloader.cpp
@@ -34,6 +34,13 @@ btVector3 getbtVector(const osg::Vec3f &v)
     return btVector3(v.x(), v.y(), v.z());
 }
 
+bool pathFileNameStartsWithX(const std::string& path)
+{
+    const std::size_t slashpos = path.find_last_of("/\\");
+    const std::size_t letterPos = slashpos == std::string::npos ? 0 : slashpos + 1;
+    return letterPos < path.size() && (path[letterPos] == 'x' || path[letterPos] == 'X');
+}
+
 }
 
 namespace NifBullet
@@ -91,10 +98,7 @@ osg::ref_ptr<Resource::BulletShape> BulletNifLoader::load(const Nif::NIFFilePtr&
 
         // files with the name convention xmodel.nif usually have keyframes stored in a separate file xmodel.kf (see Animation::addAnimSource).
         // assume all nodes in the file will be animated
-        std::string filename = nif->getFilename();
-        const std::size_t slashpos = filename.find_last_of("/\\");
-        const std::size_t letterPos = slashpos == std::string::npos ? 0 : slashpos + 1;
-        const bool isAnimated = letterPos < filename.size() && (filename[letterPos] == 'x' || filename[letterPos] == 'X');
+        const bool isAnimated = pathFileNameStartsWithX(nif->getFilename());
 
         handleNode(node, 0, autogenerated, isAnimated, autogenerated);