diff --git a/.drone.yml b/.drone.yml
index d2b3d9174..eb4c1c8d8 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -175,6 +175,7 @@ steps:
     - wget https://suitesparse-collection-website.herokuapp.com/MM/ND/nd6k.tar.gz
     - tar zxvf nd6k.tar.gz
     - LD_LIBRARY_PATH=/drone/src ./cholmod_l_demo <nd6k/nd6k.mtx
+    - LD_LIBRARY_PATH=/drone/src OMP_NUM_THREADS=1 ./cholmod_l_demo <nd6k/nd6k.mtx
 ---
 kind: pipeline
 name: epyc_native_test
@@ -209,12 +210,14 @@ steps:
     - wget https://suitesparse-collection-website.herokuapp.com/MM/ND/nd6k.tar.gz
     - tar zxvf nd6k.tar.gz
     - LD_LIBRARY_PATH=/drone/src ./cholmod_l_demo <nd6k/nd6k.mtx
+    - LD_LIBRARY_PATH=/drone/src OMP_NUM_THREADS=1 ./cholmod_l_demo <nd6k/nd6k.mtx
     - wget https://github.com/xianyi/OpenBLAS/archive/refs/tags/v0.3.5.tar.gz
     - tar zxvf v0.3.5.tar.gz
     - cd OpenBLAS-0.3.5
     - make QUIET_MAKE=1 $COMMON_FLAGS
     - cd ..
     - LD_LIBRARY_PATH=OpenBLAS-0.3.5 ./cholmod_l_demo <nd6k/nd6k.mtx
+    - LD_LIBRARY_PATH=OpenBLAS-0.3.5 OMP_NUM_THREADS=1 ./cholmod_l_demo <nd6k/nd6k.mtx
 ---
 kind: pipeline
 name: arm64_gcc10