diff --git a/.travis.yml b/.travis.yml
index 0829ca7d..55210788 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,7 +19,7 @@ script:
   - ~/.config/composer/vendor/bin/phpcs . --standard=phpcs.xml --warning-severity=0 --extensions=php -p;
   # Check PHP compatibility for the lowest supported version
   - if [[ $TRAVIS_PHP_VERSION == "5.6" ]]; then
-      ~/.config/composer/vendor/bin/phpcs . --standard=phpcompatibility.xml --warning-severity=0 --extensions=php -p;
+      ~/.config/composer/vendor/bin/phpcs . --standard=phpcompatibility.xml --extensions=php -p;
     fi
   # Run unit tests (stable)
   - if [[ $TRAVIS_PHP_VERSION == "7.0" ]]; then
@@ -29,7 +29,7 @@ script:
   # Check PHP compatibility for all versions, starting at the lowest supported version in order to detect breaking changes
   - if [[ $TRAVIS_PHP_VERSION == "nightly" ]]; then
       phpunit --configuration=phpunit.xml --include-path=lib/;
-      ~/.config/composer/vendor/bin/phpcs . --standard=PHPCompatibility --warning-severity=0 --extensions=php -p --runtime-set testVersion 5.6-;
+      ~/.config/composer/vendor/bin/phpcs . --standard=PHPCompatibility --extensions=php -p --runtime-set testVersion 5.6-;
     fi
 
 matrix:
diff --git a/phpcompatibility.xml b/phpcompatibility.xml
index f232523f..ec765ff6 100644
--- a/phpcompatibility.xml
+++ b/phpcompatibility.xml
@@ -8,7 +8,7 @@
   <!--
 
   -->
-  <config name="testVersion" value="5.6"/>
+  <config name="testVersion" value="5.6-"/>
   <rule ref="PHPCompatibility">
     <!--
     "PHP 7 changes how most errors are reported by PHP. Instead of reporting