diff --git a/.travis.yml b/.travis.yml
index 6041c939..a8022134 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,11 +16,13 @@ jobs:
     install:
       - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
       - sudo apt install g++-13
+      - sudo sysctl vm.mmap_rnd_bits=28
     script: make -j5 test-c test-cl test-error CXX=g++-13
   - name: cpp, java
     install:
       - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
       - sudo apt install g++-13
+      - sudo sysctl vm.mmap_rnd_bits=28
     script: make -j5 test-cpp test-java CXX=g++-13
   - name: cs
     install: