Perl search and replace hangs

[unixuser]

hello everyone,
if no files exist for the wild card' piece of the following command, running in unix the command just hangs .....

perl -i -p -e 's/xxxxxxxxx/yyyyyyyyyyy/g' `find . -name "*.abc" -exec grep -l "xxxxxxxxx" {} /dev/null \;`

Any suggestions?

Thanks!