General :: Bulk File Rename Not Working As Expected?

Y want to rename a bunch of files and directories to remove the space on the names, easy enough right?

Code:
for source in $(find ./); do target=$(echo "$source"|sed -e 's/ /_/g'); mv -f "$source" $target; done

Well, I thought that should have work but the problem is that $source comes up broken, when I run it with echo instead of mv I get the echo with broken names.

Code:
In this case "$source"="This is the file I want to rename"
$ echo "$source"

[Code]....