diff --git a/util/run-gnu-test.sh b/util/run-gnu-test.sh
index 6d0edee5f14..23d78ca625a 100755
--- a/util/run-gnu-test.sh
+++ b/util/run-gnu-test.sh
@@ -28,7 +28,8 @@ echo "path_UUTILS='${path_UUTILS}'"
 echo "path_GNU='${path_GNU}'"
 
 # Use GNU nproc for *BSD
-MAKEFLAGS="${MAKEFLAGS} -j $(${path_GNU}/src/nproc)"
+NPROC=$(command -v ${path_GNU}/src/nproc||command -v nproc)
+MAKEFLAGS="${MAKEFLAGS} -j ${NPROC}"
 export MAKEFLAGS
 ###