diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index cb1cccaae1cc050fc53f2c4129564106ecc29013..ef9c5c287d3c429857d7f1ebecdea6a9df540619 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -16,21 +16,8 @@ before_script:
   - mkdir -p ${DEBUG_DIR}
   - export OMP_NUM_THREADS=${CPU_SIM}
 
-build-debug-core:
-  stage: build
-  script:
-    - rm -rf ../CORE
-    - git clone https://git.ecdf.ed.ac.uk/tadah/core.git ../CORE
-    - cd ../CORE
-    - mkdir -p ${DEBUG_DIR}
-    - cd ${DEBUG_DIR}
-    - cmake .. -DCMAKE_CXX_FLAGS="-g -O1 -fsanitize=address -Wall -Wpedantic -pedantic-errors -Wextra --coverage"
-    - make -j ${CPU_BUILD}
-
 build-debug:
   stage: build
-  needs:
-    - job: build-debug-core
   script:
     - cd ${DEBUG_DIR}
     - cmake .. -DCMAKE_CXX_FLAGS="-g -O1 -fsanitize=address -Wall -Wpedantic -pedantic-errors -Wextra --coverage"