diff --git a/.gitlab-ci/build/gitlab-ci.yml b/.gitlab-ci/build/gitlab-ci.yml
index 75f7500cad3..9d4178f003c 100644
--- a/.gitlab-ci/build/gitlab-ci.yml
+++ b/.gitlab-ci/build/gitlab-ci.yml
@@ -419,7 +419,6 @@ debian-clang:
       -Wno-error=implicit-const-int-float-conversion
       -Wno-error=initializer-overrides
       -Wno-error=sometimes-uninitialized
-      -Wno-error=unused-function
     CPP_ARGS: >
       -Wno-error=c99-designator
       -Wno-error=implicit-const-int-float-conversion