diff --git a/ci/smoketests.gitlab-ci.yml b/ci/smoketests.gitlab-ci.yml
index 853333164..c69d39244 100644
--- a/ci/smoketests.gitlab-ci.yml
+++ b/ci/smoketests.gitlab-ci.yml
@@ -47,9 +47,11 @@ buildsmoketests:x86-64:linux:clang-10:cxx11-on:
     - apt-get install --no-install-recommends -y ${EIGEN_CI_CXX_COMPILER}
       ${EIGEN_CI_CC_COMPILER} cmake ninja-build xsltproc
   script:
+    - export NPROC=`nproc`
+    - echo ${NPROC}
     - export CXX=${EIGEN_CI_CXX_COMPILER}
     - export CC=${EIGEN_CI_CC_COMPILER}
-    - cd ${BUILDDIR} && ctest --output-on-failure --no-compress-output
+    - cd ${BUILDDIR} && ctest -j${NPROC} --output-on-failure --no-compress-output
       --build-no-clean -T test -L smoketest
   after_script:
     - apt-get update -y
diff --git a/ci/test.gitlab-ci.yml b/ci/test.gitlab-ci.yml
index 3525ae979..2f967e304 100644
--- a/ci/test.gitlab-ci.yml
+++ b/ci/test.gitlab-ci.yml
@@ -10,9 +10,11 @@
     - apt-get install --no-install-recommends -y ${EIGEN_CI_CXX_COMPILER}
       ${EIGEN_CI_CC_COMPILER} cmake ninja-build xsltproc
   script:
+    - export NPROC=`nproc`
+    - echo ${NPROC}
     - export CXX=${EIGEN_CI_CXX_COMPILER}
     - export CC=${EIGEN_CI_CC_COMPILER}
-    - cd ${BUILDDIR} && ctest --output-on-failure --no-compress-output
+    - cd ${BUILDDIR} && ctest -j${NPROC} --output-on-failure --no-compress-output
       --build-no-clean -T test -L ${EIGEN_CI_TEST_LABEL}
   after_script:
     - apt-get update -y