diff --git a/test_install_octree.bash b/test_install_octree.bash
index 7fad19a4b6be23b3e6bda2355949a1ddc20fd591..b2b86c2fd2ecdd5d50fbed42c32616bd76073016 100755
--- a/test_install_octree.bash
+++ b/test_install_octree.bash
@@ -1 +1,3 @@
+export DEBUG=1 #show extra log
+export HW_FLAGS='-O3 -fopenmp' #enable openmp and optimisation in compilation step
 pip install 'hotwheels_io[tested] @ git+ssh://git@git.ia2.inaf.it/hotwheels/io.git@v0.0.2alpha'