diff --git a/examples/friction.cpp b/examples/friction.cpp
index f3c99965..6d9cb1e3 100644
--- a/examples/friction.cpp
+++ b/examples/friction.cpp
@@ -140,6 +140,7 @@ class System {
 
         m_Eps = m_quad.AllocateQtensor<2>(0.0);
         m_Sig = m_quad.AllocateQtensor<2>(0.0);
+
         // --------
         // material
         // --------