diff --git a/templates/qe/6.5/data.qe.arm.cpu.opt.config b/templates/qe/6.5/data.qe.arm.cpu.opt.config
index 3428abf433d12efae6461719c53fcc575718096d..827583b40bb8549d7d6b1fec2638f57e2ea49022 100644
--- a/templates/qe/6.5/data.qe.arm.cpu.opt.config
+++ b/templates/qe/6.5/data.qe.arm.cpu.opt.config
@@ -45,6 +45,6 @@ make install
 make clean
 
 [RUN]
-run = mpirun --allow-run-as-root -x OMP_NUM_THREADS=1 -np 8
+run = mpirun --allow-run-as-root -x OMP_NUM_THREADS=1 -np $(nproc)
 binary = pw.x -input test_3.in
 nodes = 1