diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 760f908abd8558b580ebdfd9d8d39bcadac4d2fc..342a6c4dc8f3d0dcd2229f2a3d65bd81523605c6 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -281,11 +281,13 @@ build-codec-instrumented-linux:
 # make sure that the codec builds with msan, asan and usan
 build-codec-sanitizers-linux:
   extends:
-    - .build-job-linux
+    - .build-job-with-check-for-warnings
     - .rules-basis
   script:
     - *print-common-info
     - bash ci/build_codec_sanitizers_linux.sh
+    # need to use the "|| exit $?" suffix to get the allowed_failure return code, otherwise the job fails with code 1...<
+    - ci/check_for_warnings.py $BUILD_OUTPUT || exit $?
 
 build-codec-windows-cmake:
   extends:
diff --git a/ci/build_codec_sanitizers_linux.sh b/ci/build_codec_sanitizers_linux.sh
index d352fa32ec1cd6d8d3283c4984ba428c117b5769..4e40f89b9a028d89363c97ec2fbab109474334b8 100755
--- a/ci/build_codec_sanitizers_linux.sh
+++ b/ci/build_codec_sanitizers_linux.sh
@@ -40,4 +40,5 @@ make CLANG=1 -j
 make clean
 make CLANG=2 -j
 make clean
-make CLANG=3 -j
+# write out one build for warnings check
+make CLANG=3 -j 2>&1 | tee build_output.txt