diff --git a/nexus/lib/machines.py b/nexus/lib/machines.py
index 4983d47a77..2f04ffffb8 100644
--- a/nexus/lib/machines.py
+++ b/nexus/lib/machines.py
@@ -2314,7 +2314,7 @@ def write_job_header(self,job):
 echo $SLURM_SUBMIT_DIR
 cd $SLURM_SUBMIT_DIR
 '''
-        if job.threads>1:
+        if (job.threads>1) and ('cpu' in job.constraint):
             c+='''
 export OMP_PROC_BIND=true
 export OMP_PLACES=threads