diff --git a/.travis.sh b/.travis.sh
index 8b2b21e66..bc9029595 100755
--- a/.travis.sh
+++ b/.travis.sh
@@ -24,7 +24,7 @@ function configure()
       -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE:-Debug} \
       -DGTSAM_BUILD_TESTS=${GTSAM_BUILD_TESTS:-OFF} \
       -DGTSAM_BUILD_UNSTABLE=${GTSAM_BUILD_UNSTABLE:-ON} \
-      -DGTSAM_USE_QUATERNIONS=${GTSAM_BUILD_UNSTABLE:-OFF} \
+      -DGTSAM_USE_QUATERNIONS=${GTSAM_USE_QUATERNIONS:-OFF} \
       -DGTSAM_BUILD_EXAMPLES_ALWAYS=${GTSAM_BUILD_EXAMPLES_ALWAYS:-ON} \
       -DGTSAM_ALLOW_DEPRECATED_SINCE_V4=${GTSAM_ALLOW_DEPRECATED_SINCE_V4:-OFF} \
       -DGTSAM_BUILD_WITH_MARCH_NATIVE=OFF \