diff --git a/ci/travis-config.sh b/ci/travis-config.sh
index 85e6a9790..260c4b78c 100644
--- a/ci/travis-config.sh
+++ b/ci/travis-config.sh
@@ -5,6 +5,7 @@
 # This file is sourced by travis.sh, and exports the variables
 # to the environment.
 CMAKE_ARGS="\
+  -DCMAKE_BUILD_TYPE=Debug \
   -DWEBVIEW_FORCE_WEBKIT=1 \
   -DKDE_INSTALL_USE_QT_SYS_PATHS=ON \
   -DWITH_PYTHONQT=OFF"