diff --git a/upload.sh b/upload.sh
index 618ec0f..ad71278 100644
--- a/upload.sh
+++ b/upload.sh
@@ -2,5 +2,6 @@
 
 for FILE in output/epubs/*
 do
-  curl -Ss -u "${USERNAME}":"${PASSWORD}" -T "${FILE}" "https://cloud.crystalyx.net/remote.php/dav/files/${USERNAME}/Public/TWI/${FILE##*/}"
+  FILE_URL=$(sed "s/ /%20/g" <<< "${FILE##*/}")
+  curl -Ss -u "${USERNAME}":"${PASSWORD}" -T "${FILE}" "https://cloud.crystalyx.net/remote.php/dav/files/${USERNAME}/Public/TWI/${FILE_URL}"
 done