diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 00e230c8c..8421d14a3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -296,7 +296,6 @@ jobs:
             -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON \
             -DPELE_DIM:STRING=${DIM} \
             -DPELE_ENABLE_MPI:BOOL=ON \
-            -DMPIEXEC_NUMPROC_FLAG:STRING=-np \
             -DPELE_ENABLE_FCOMPARE_FOR_TESTS:BOOL=OFF \
             -DPELE_ENABLE_MASA:BOOL=ON \
             -DPELE_EXCLUDE_BUILD_IN_CI:BOOL=ON \