diff --git a/.travis.yml b/.travis.yml
index 36f51cd11..3636bb597 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,8 +17,10 @@ matrix:
   allow_failures:
 #    - env: MYSQL_VERSION=mysql-system
 #    - env: MYSQL_VERSION=mariadb-5.5.44
-#    - env: MYSQL_VERSION=mariadb-10.0.20 MROONGA_BUNDLED=yes
-#    - env: MYSQL_VERSION=mariadb-10.0.20 MROONGA_BUNDLED=yes MROONGA_TEST_EMBEDDED=yes
+    - env: MYSQL_VERSION=mariadb-10.0.20
+    - env: MYSQL_VERSION=mariadb-10.0.20 CFLAGS=-funsigned-char CXXFLAGS=-funsigned-char
+    - env: MYSQL_VERSION=mariadb-10.0.20 MROONGA_BUNDLED=yes
+    - env: MYSQL_VERSION=mariadb-10.0.20 MROONGA_BUNDLED=yes MROONGA_TEST_EMBEDDED=yes
 #    - env: MYSQL_VERSION=mariadb-10.1.4
 install:
   - tools/travis/install.sh