diff --git a/my_ocrd_workflow b/my_ocrd_workflow
index 37bfc6e..89b16f6 100755
--- a/my_ocrd_workflow
+++ b/my_ocrd_workflow
@@ -40,7 +40,7 @@ do_binarization() {
   remove_filegrp OCR-D-IMG-BIN mets.xml
   ocrd-olena-binarize -l $LOG_LEVEL \
     -m mets.xml -I OCR-D-IMG -O OCR-D-IMG-BINPAGE \
-    -p <(echo '{"impl": "sauvola-ms-split"}')
+    -p '{"impl": "sauvola-ms-split"}'
 }
 
 do_fontident() {
@@ -56,7 +56,7 @@ do_fontident() {
   remove_filegrp OCR-D-OCR-FONTIDENT mets.xml
   ocrd-typegroups-classifier -l $LOG_LEVEL \
     -m mets.xml -I OCR-D-IMG -O OCR-D-OCR-FONTIDENT \
-    -p <(echo $ocrd_typegroups_classifier_parameters)
+    -p "$ocrd_typegroups_classifier_parameters"
   # XXX Check if ocrd-typegroups-classifier uses the whole image
   # XXX does DEFAULT have any meaning? /buerger_gedichte_1778.ocrd does not have
   #     any DEFAULT, yet -I DEFAULT seems to work for ocrd-typegroups-classifier
@@ -97,7 +97,7 @@ do_ocr() {
   remove_filegrp OCR-D-OCR-TESS mets.xml
   ocrd-tesserocr-recognize -l $LOG_LEVEL \
     -m mets.xml -I OCR-D-SEG-LINE -O OCR-D-OCR-TESS \
-    -p <(echo $ocrd_tesserocr_recognize_parameters)
+    -p "$ocrd_tesserocr_recognize_parameters"
 }
 
 do_ocr_calamari() {
@@ -105,7 +105,7 @@ do_ocr_calamari() {
   remove_filegrp OCR-D-OCR-CALAMARI mets.xml
   ocrd-calamari-recognize -l $LOG_LEVEL \
     -m mets.xml -I OCR-D-SEG-LINE -O OCR-D-OCR-CALAMARI \
-    -p <(echo $ocrd_calamari_recognize_parameters)
+    -p "$ocrd_calamari_recognize_parameters"
 }
 
 page_validate_xml() {