diff --git a/.github/workflows/meson-build.yml b/.github/workflows/meson-build.yml
index 9c94f27e..760d2da4 100644
--- a/.github/workflows/meson-build.yml
+++ b/.github/workflows/meson-build.yml
@@ -26,8 +26,8 @@ jobs:
     - name: Install valgrind manually
       run: sudo apt-get install valgrind
     - name: Run valgrind on unittest_common
-      run: valgrind $GITHUB_WORKSPACE/build_lib/tests/check/unittest_common
+      run: CK_FORK=no valgrind $GITHUB_WORKSPACE/build_lib/tests/check/unittest_common
     - name: Run valgrind on unittest_sign
-      run: valgrind $GITHUB_WORKSPACE/build_lib/tests/check/unittest_sign
+      run: CK_FORK=no valgrind $GITHUB_WORKSPACE/build_lib/tests/check/unittest_sign
     - name: Run valgrind on unittest_auth
-      run: valgrind $GITHUB_WORKSPACE/build_lib/tests/check/unittest_auth
+      run: CK_FORK=no valgrind $GITHUB_WORKSPACE/build_lib/tests/check/unittest_auth