diff --git a/ref/build.sh b/ref/build.sh
index 84da14f..4587d76 100755
--- a/ref/build.sh
+++ b/ref/build.sh
@@ -58,5 +58,7 @@ cmake -DCMAKE_BUILD_TYPE=${BUILD_TYPE} ..
 make -j4 VERBOSE=1
 
 # Run the test suite
+export OMP_PLACES=cores
+export OMP_PROC_BIND=close
 export OMP_NUM_THREADS=4
 ctest