diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f7a1eb711c..27c7e287c3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -374,6 +374,7 @@ stages:
     - >
       "$PYTEST" --junit-xml="$CI_PROJECT_DIR"/junit.xml -n "$TEST_PARALLEL_JOBS" | tee pytest.out.txt
     - '( ! grep -F "grep: warning:" pytest.out.txt )'
+    - make clean >/dev/null 2>&1
   after_script:
     - test -n "${OUT_OF_TREE_WORKSPACE}" && cd "${OUT_OF_TREE_WORKSPACE}"
     - *display_pytest_failures
@@ -428,6 +429,7 @@ stages:
     - test -n "${OUT_OF_TREE_WORKSPACE}" && cd "${OUT_OF_TREE_WORKSPACE}"
   script:
     - make -j${TEST_PARALLEL_JOBS:-1} -k unit V=1
+    - make clean >/dev/null 2>&1
   after_script:
     - test -d bind-* && cd bind-*
     - REALSOURCEDIR="$PWD"
@@ -1623,6 +1625,7 @@ respdiff:
     MAX_DISAGREEMENTS_PERCENTAGE: "0.15"
   script:
     - bash respdiff.sh -m /usr/lib/x86_64-linux-gnu/libjemalloc.so.2 -s named -q "${PWD}/100k_mixed.txt" -c 3 -w "${PWD}/rspworkdir" "${CI_PROJECT_DIR}" "/usr/local/respdiff-reference-bind/sbin/named"
+    - cd ../.. && make clean >/dev/null 2>&1
 
 respdiff:asan:
   <<: *respdiff_job
@@ -1636,6 +1639,7 @@ respdiff:asan:
     MAX_DISAGREEMENTS_PERCENTAGE: "0.15"
   script:
     - bash respdiff.sh -s named -q "${PWD}/100k_mixed.txt" -c 3 -w "${PWD}/rspworkdir" "${CI_PROJECT_DIR}" "/usr/local/respdiff-reference-bind/sbin/named"
+    - cd ../.. && make clean >/dev/null 2>&1
 
 respdiff:tsan:
   <<: *respdiff_job
@@ -1650,6 +1654,7 @@ respdiff:tsan:
     TSAN_OPTIONS: "${TSAN_OPTIONS_DEBIAN}"
   script:
     - bash respdiff.sh -s named -q "${PWD}/100k_mixed.txt" -c 3 -w "${PWD}/rspworkdir" "${CI_PROJECT_DIR}" "/usr/local/respdiff-reference-bind/sbin/named"
+    - cd ../.. && make clean >/dev/null 2>&1
   after_script:
     - *find_python
     - *parse_tsan
@@ -1664,6 +1669,7 @@ respdiff-third-party:
     MAX_DISAGREEMENTS_PERCENTAGE: "0.2"
   script:
     - bash respdiff.sh -s third_party -q "${PWD}/100k_mixed.txt" -c 1 -w "${PWD}/rspworkdir" "${CI_PROJECT_DIR}"
+    - cd ../.. && make clean >/dev/null 2>&1
 
 # Performance tests