diff --git a/build-book-converter.jenkins b/build-book-converter.jenkins
index e006096..768700b 100644
--- a/build-book-converter.jenkins
+++ b/build-book-converter.jenkins
@@ -48,14 +48,14 @@ ENTRYPOINT ["/bin/bash", "-c", "/calibre/entrypoint.sh"]
 """
                     dockerScript = """#!/usr/bin/env bash
 
-IFS=$'\\n'
+IFS=\$'\\n'
 
 while true; do
         sleep 5s
-        if [ -z "$(find /calibre/input -type f \\( -iname \\*.mobi -o -iname \\*.epub -o \\*.prc \\) -print -quit)" ]; then
-                for i in $(find /calibre/input -type f \\( -iname \\*.mobi -o -iname \\*.epub -o \\*.prc \\)); do
-                        /opt/calibre/ebook-convert "${i}" "/calibre/output/${i%.*}.azw3"
-                        rm -f -v "${i}"
+        if [ -z "\$(find /calibre/input -type f \\( -iname \\*.mobi -o -iname \\*.epub -o \\*.prc \\) -print -quit)" ]; then
+                for i in \$(find /calibre/input -type f \\( -iname \\*.mobi -o -iname \\*.epub -o \\*.prc \\)); do
+                        /opt/calibre/ebook-convert "\${i}" "/calibre/output/\${i%.*}.azw3"
+                        rm -f -v "\${i}"
                 done
         fi
 done