Converting .csh to .bash script that removes directory using find and rm

I am converting a one-line script from csh to bash. The script simply removes a directory as specified by an argument on the command line.

cleanup.sh:

#!/bin/sh
find $1/testdir -exec rm -Rf {} +

works perfectly.

The following - cleanup.bash:

#!/bin/bash
find $1/testdir -exec rm -Rf {} +

results in the following error


$ bash cleanup.bash directory1
find: paths must precede expression:
Usage: find [-H] [-L] [-P] [-Olevel] [-D help|tree|search|stat|rates|opt|exec] [path...] [expression]

Been racking my brains trying all sorts of things for a day now with suggestions from google. Please note - from the command line, this works perfectly. Just does not run inside bash script.