diff --git a/lib/algorithms/iterative/ImplicitlyRestartedLanczos.h b/lib/algorithms/iterative/ImplicitlyRestartedLanczos.h
index c71cbdcd..97c10b30 100644
--- a/lib/algorithms/iterative/ImplicitlyRestartedLanczos.h
+++ b/lib/algorithms/iterative/ImplicitlyRestartedLanczos.h
@@ -1,3 +1,4 @@
+#if 0
 #ifndef GRID_IRL_H
 #define GRID_IRL_H
 
@@ -1019,3 +1020,4 @@ static void Lock(DenseMatrix<T> &H, 	///Hess mtx
 
 }
 #endif
+#endif