diff --git a/ocr b/ocr
index 47d7c10..8ee7cb9 100755
--- a/ocr
+++ b/ocr
@@ -120,14 +120,12 @@ class OCRWorkflow(WorkflowRunner):
         ocropusnlbin_jobs = []
         ocropusnlbin_job_number = 0
         for job in self.jobs:
-            # This list is empty if you don't wait for ocropus_nlbin_jobs to complete
-            for file in os.listdir(os.path.join(job["output_dir"], "tmp", "tiff_files")):
-                ocropusnlbin_job_number += 1
-                cmd = 'ocropus-nlbin -o "%s" "%s"' % (
-                    os.path.join(job["output_dir"], "tmp", "ocropus-nlbin"),
-                    os.path.join(job["output_dir"], "tmp", "tiff_files", file)
-                )
-                ocropusnlbin_jobs.append(self.addTask(label="ocropusnlbin_job_-_%i" % (ocropusnlbin_job_number), command=cmd, dependencies=split_jobs))
+            ocropusnlbin_job_number += 1
+            cmd = 'ocropus-nlbin -o "%s" "%s"/*' % (
+                os.path.join(job["output_dir"], "tmp", "ocropus-nlbin"),
+                os.path.join(job["output_dir"], "tmp", "tiff_files")
+            )
+            ocropusnlbin_jobs.append(self.addTask(label="ocropusnlbin_job_-_%i" % (ocropusnlbin_job_number), command=cmd, dependencies=split_jobs, nCores=max(1, self.nCores / length(self.jobs)))
 
         ###
         # Task "tesseract_job": perform OCR on binarized images