diff --git a/sci-libs/CombBLAS/CombBLAS-1.16.0_p20220331-r1.ebuild b/sci-libs/CombBLAS/CombBLAS-1.16.0_p20220331-r1.ebuild
index f713134d29..a27963ccc9 100644
--- a/sci-libs/CombBLAS/CombBLAS-1.16.0_p20220331-r1.ebuild
+++ b/sci-libs/CombBLAS/CombBLAS-1.16.0_p20220331-r1.ebuild
@@ -25,6 +25,7 @@ DEPEND="
 "
 RDEPEND="${DEPEND}"
 
+RESTRICT="test" # tests require an MPI setup
 PATCHES=(
 	"${FILESDIR}/${P}-rename-THRESHOLD.patch"
 	"${FILESDIR}/${P}-psort.patch"