diff --git a/.gitlab-ci.d/custom-runners/ubuntu-20.04-s390x.yml b/.gitlab-ci.d/custom-runners/ubuntu-20.04-s390x.yml
index 0333872113..4f292a8a5b 100644
--- a/.gitlab-ci.d/custom-runners/ubuntu-20.04-s390x.yml
+++ b/.gitlab-ci.d/custom-runners/ubuntu-20.04-s390x.yml
@@ -8,6 +8,8 @@ ubuntu-20.04-s390x-all-linux-static:
  tags:
  - ubuntu_20.04
  - s390x
+ variables:
+    DFLTCC: 0
  rules:
  - if: '$CI_PROJECT_NAMESPACE == "qemu-project" && $CI_COMMIT_BRANCH =~ /^staging/'
  - if: "$S390X_RUNNER_AVAILABLE"
@@ -27,6 +29,8 @@ ubuntu-20.04-s390x-all:
  tags:
  - ubuntu_20.04
  - s390x
+ variables:
+    DFLTCC: 0
  rules:
  - if: '$CI_PROJECT_NAMESPACE == "qemu-project" && $CI_COMMIT_BRANCH =~ /^staging/'
  - if: "$S390X_RUNNER_AVAILABLE"
@@ -43,6 +47,8 @@ ubuntu-20.04-s390x-alldbg:
  tags:
  - ubuntu_20.04
  - s390x
+ variables:
+    DFLTCC: 0
  rules:
  - if: '$CI_PROJECT_NAMESPACE == "qemu-project" && $CI_COMMIT_BRANCH =~ /^staging/'
    when: manual
@@ -64,6 +70,8 @@ ubuntu-20.04-s390x-clang:
  tags:
  - ubuntu_20.04
  - s390x
+ variables:
+    DFLTCC: 0
  rules:
  - if: '$CI_PROJECT_NAMESPACE == "qemu-project" && $CI_COMMIT_BRANCH =~ /^staging/'
    when: manual
@@ -84,6 +92,8 @@ ubuntu-20.04-s390x-tci:
  tags:
  - ubuntu_20.04
  - s390x
+ variables:
+    DFLTCC: 0
  rules:
  - if: '$CI_PROJECT_NAMESPACE == "qemu-project" && $CI_COMMIT_BRANCH =~ /^staging/'
    when: manual
@@ -103,6 +113,8 @@ ubuntu-20.04-s390x-notcg:
  tags:
  - ubuntu_20.04
  - s390x
+ variables:
+    DFLTCC: 0
  rules:
  - if: '$CI_PROJECT_NAMESPACE == "qemu-project" && $CI_COMMIT_BRANCH =~ /^staging/'
    when: manual
diff --git a/.travis.yml b/.travis.yml
index c3c8048842..9afc4a54b8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -218,6 +218,7 @@ jobs:
         - TEST_CMD="make check check-tcg V=1"
         - CONFIG="--disable-containers --target-list=${MAIN_SOFTMMU_TARGETS},s390x-linux-user"
         - UNRELIABLE=true
+        - DFLTCC=0
       script:
         - BUILD_RC=0 && make -j${JOBS} || BUILD_RC=$?
         - |
@@ -257,7 +258,7 @@ jobs:
       env:
         - CONFIG="--disable-containers --audio-drv-list=sdl --disable-user
                   --target-list-exclude=${MAIN_SOFTMMU_TARGETS}"
-
+        - DFLTCC=0
     - name: "[s390x] GCC (user)"
       arch: s390x
       dist: focal
@@ -269,7 +270,7 @@ jobs:
           - ninja-build
       env:
         - CONFIG="--disable-containers --disable-system"
-
+        - DFLTCC=0
     - name: "[s390x] Clang (disable-tcg)"
       arch: s390x
       dist: focal
@@ -303,3 +304,4 @@ jobs:
         - CONFIG="--disable-containers --disable-tcg --enable-kvm
                   --disable-tools --host-cc=clang --cxx=clang++"
         - UNRELIABLE=true
+        - DFLTCC=0