diff --git a/test/php/runtests.sh b/test/php/runtests.sh
index a8b6901f4..0caa34742 100755
--- a/test/php/runtests.sh
+++ b/test/php/runtests.sh
@@ -4,10 +4,18 @@ set -o nounset
 
 SCRIPTNAME=$(readlink -f $0)
 DIR=$(dirname $SCRIPTNAME)
+PHPUNIT=$(which phpunit)
+
+if [[ ! -x $PHPUNIT ]]; then
+    echo "PHPUnit not found!"
+    exit 1
+fi
 
 # Make sure that the destination directory for logs and reports exists
 mkdir -p $DIR/../../build/log
 
-phpunit "$@" .
+cd $DIR
+
+$PHPUNIT "$@" .
 
 exit 0