diff --git a/ocr b/ocr
index c7b50ff..c80a3ac 100755
--- a/ocr
+++ b/ocr
@@ -116,15 +116,18 @@ class OCRWorkflow(WorkflowRunner):
         # Task "ocropus_nlbin_job": binarize tiff files from previous split
         # Dependencies: split_jobs
         ###
+        self.waitForTasks()
         ocropusnlbin_jobs = []
         ocropusnlbin_job_number = 0
         for job in self.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))
+            # 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))
 
         ###
         # Task "tesseract_job": perform OCR on binarized images