diff --git a/.travis.yml b/.travis.yml
index 39040f8..39dd445 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -35,7 +35,7 @@ env:
   - ZSH=4.3.12
   - ZSH=4.3.11
 
-script: docker run -v $PWD:/work -w /work zshusers/zsh:${ZSH} /bin/sh -c 'install_packages make procps && make test'
+script: docker run -v $PWD:/work -w /work zshusers/zsh:${ZSH} /bin/sh -c 'install_packages make procps bsdmainutils && make test'
 
 notifications:
   webhooks:
diff --git a/tests/test-highlighting.zsh b/tests/test-highlighting.zsh
index e03287f..d12b44c 100755
--- a/tests/test-highlighting.zsh
+++ b/tests/test-highlighting.zsh
@@ -230,7 +230,10 @@ run_test_internal() {
         if (( difference > 0 )); then
           left_column+=( ${(r:2*difference::. :):-} )
         fi
-        print -rC2 -- "${left_column[@]}" "${right_column[@]}" \
+        paste \
+          =(print -rC1 -- $left_column) \
+          =(print -rC1 -- $right_column) \
+          | if type column >/dev/null; then column -t -s $'\t'; else cat; fi \
           | sed 's/^/# /'
       }
     fi