diff --git a/tools/ci/amd64/gcc/valgrind.sh b/tools/ci/amd64/gcc/valgrind.sh
index b60680b..54fe79b 100755
--- a/tools/ci/amd64/gcc/valgrind.sh
+++ b/tools/ci/amd64/gcc/valgrind.sh
@@ -6,6 +6,9 @@ set -e
 cd $(git rev-parse --show-toplevel)/
 rm -rf ./build
 
+Xvfb :99 -screen 0 1024x768x16 &
+export DISPLAY=:99
+
 conan build . \
   -c tools.system.package_manager:mode=install \
   -c tools.cmake.cmaketoolchain:generator=Ninja \