diff --git a/.travis.yml b/.travis.yml
index 9e32bb2..c292b28 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -34,6 +34,10 @@ matrix:
       sudo: false
 
 install:
+  - for i in 0 1; do for j in `seq 0 7`; do echo -ne "\033[${i};3${j}ma"; done; done
+  - for i in 0 1; do for j in `seq 0 7`; do echo -ne "\033[${i};4${j}ma"; done; done
+  - for j in `seq 0 255`; do echo -ne "\033[38;5;${j}ma"; done
+  - for j in `seq 0 255`; do echo -ne "\033[48;5;${j}ma"; done
   # The sikuli-ide packaged with ubuntu 16.04 does not seem to work correctly: missing dependencies, some dependencies are too recent, …
   - mkdir ~/sikulix/
   - wget https://launchpadlibrarian.net/359997648/sikulixsetup-1.1.2.jar -O ~/sikulix/sikulixsetup-1.1.2.jar