diff --git a/.gitlab/includes/clang18_pipeline.yml b/.gitlab/includes/clang18_pipeline.yml
index e0f926886..3d11007b9 100644
--- a/.gitlab/includes/clang18_pipeline.yml
+++ b/.gitlab/includes/clang18_pipeline.yml
@@ -16,7 +16,7 @@ include:
     SPACK_SPEC: "pika@main arch=$SPACK_ARCH %${COMPILER} malloc=system cxxstd=$CXXSTD ^boost@1.85.0 \
                  ^hwloc@2.9.1"
     CMAKE_FLAGS: "-DPIKA_WITH_CXX_STANDARD=$CXXSTD -DPIKA_WITH_MALLOC=system
-                  -DPIKA_WITH_SPINLOCK_DEADLOCK_DETECTION=ON"
+                  -DPIKA_WITH_SPINLOCK_DEADLOCK_DETECTION=ON -DCMAKE_CXX_CLANG_TIDY=clang-tidy"
 
 clang18_spack_compiler_image:
   extends: