diff --git a/Mk/Uses/meson.mk b/Mk/Uses/meson.mk
--- a/Mk/Uses/meson.mk
+++ b/Mk/Uses/meson.mk
@@ -71,6 +71,7 @@
 
 INSTALL_WRKSRC=		${WRKSRC}/${MESON_BUILD_DIR}
 
+TEST_ENV+=		MESON_TESTTHREADS=${MAKE_JOBS_NUMBER}
 TEST_WRKSRC=		${WRKSRC}/${MESON_BUILD_DIR}
 TEST_TARGET=		test