diff --git a/.travis.yml b/.travis.yml
index 86b9411..39680ae 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -28,14 +28,14 @@ script:
     fi
   - |
     if [ "x$COVERAGE" == "xyes" ]; then
-      if [[ -z "${EXCLUDE_GROUP}" ]]; then
+      if [ "x$EXCLUDE_GROUP" != "x" ]; then
         ./vendor/bin/phpunit --configuration phpunit.travis.xml --exclude-group $EXCLUDE_GROUP --coverage-clover build/logs/clover.xml
       else
         ./vendor/bin/phpunit --configuration phpunit.travis.xml --coverage-clover build/logs/clover.xml
       fi
     else
-      if [[ -z "${EXCLUDE_GROUP}" ]]; then
-       ./vendor/bin/phpunit --configuration phpunit.travis.xml --group $EXCLUDEGROUP
+      if [ "x$EXCLUDE_GROUP" != "x" ]; then
+       ./vendor/bin/phpunit --configuration phpunit.travis.xml --exclude-group $EXCLUDE_GROUP
       else
        ./vendor/bin/phpunit --configuration phpunit.travis.xml
       fi
diff --git a/tests.sh b/tests.sh
index 2e9f0a0..8909dc4 100755
--- a/tests.sh
+++ b/tests.sh
@@ -2,4 +2,8 @@
 
 psql postgres -U postgres -tc "SELECT 1 FROM pg_database WHERE datname = 'testing'" | grep -q 1 || psql postgres -U postgres -c "CREATE DATABASE testing"
 composer lint
-php -d pcov.directory='.' vendor/bin/phpunit --coverage-html build
+if [ "x$EXCLUDE_GROUP" != "x" ]; then
+    php -d pcov.directory='.' vendor/bin/phpunit --exclude-group $EXCLUDE_GROUP --coverage-html build
+else
+    php -d pcov.directory='.' vendor/bin/phpunit --coverage-html build
+fi