diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 512a4d19087bd66c5c895f3f4c5595190122132c..5a81ac8cbd6f27bb4388eab11d6d4b1b15875410 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -25,7 +25,7 @@ linux:
   script:
     - mkdir build
     - cd build
-    - cmake .. -DWITH_OPTFLOW=TRUE -DBUILD_CALIBRATION=TRUE
+    - cmake .. -DWITH_OPTFLOW=TRUE -DBUILD_CALIBRATION=TRUE -DCMAKE_BUILD_TYPE=Release
     - make
     - ctest --output-on-failure