diff --git a/.travis.yml b/.travis.yml
index a5bb068..cbe61a8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,3 +7,4 @@
   - osx
 script:
   - ./autogen.sh && ./configure && make && make check
+  - make clean && ./configure --enable-64-bit-words && make && make check