diff --git a/.travis.yml b/.travis.yml
index d9bdd5ea5..0c36495f7 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -60,6 +60,9 @@ script:
   - |
     if [[ ! -z "$WP_VERSION" ]] ; then
       phpunit
+    fi
+ - |
+    if [[ ! -z "$WP_VERSION" && "$WP_VERSION" -ne "5.6" ]] ; then
       composer test:unit
     fi
   - |