diff --git a/mriqc/workflows/functional/base.py b/mriqc/workflows/functional/base.py
index fb49e876..41f661c7 100644
--- a/mriqc/workflows/functional/base.py
+++ b/mriqc/workflows/functional/base.py
@@ -351,6 +351,7 @@ def compute_iqms(name='ComputeIQMs'):
         FunctionalQC(),
         name='measures',
         mem_gb=mem_gb * 3,
+        n_procs=max(1, config.nipype.nprocs // 2),
         iterfield=['in_epi', 'in_hmc', 'in_tsnr', 'in_dvars', 'in_fwhm'],
     )