diff --git a/.travis.yml b/.travis.yml
index e68b5d4142..c25b510878 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -61,7 +61,7 @@ before_script:
 
 script:
   - "make -s test TESTOPTS=--color=never"
-  - "make -s $JOBS test-all TESTOPTS='-q --color=never --job-status=normal'"
+  - "make -s $JOBS test-all -o exts TESTOPTS='-q --color=never --job-status=normal'"
   - "make -s $JOBS test-rubyspec MSPECOPT=-j"
 
 # Branch matrix.  Not all branches are Travis-ready so we limit branches here.