diff --git a/internal/rosa/openssl.go b/internal/rosa/openssl.go
index c218e8a..df8c4a9 100644
--- a/internal/rosa/openssl.go
+++ b/internal/rosa/openssl.go
@@ -27,7 +27,7 @@ func (t Toolchain) newOpenSSL() pkg.Artifact {
 `,
 		CheckName: "test",
 		Make: []string{
-			"HARNESS_JOBS=256",
+			`HARNESS_JOBS="$(expr "$(nproc)" '*' 2)"`,
 		},
 	},
 		t.Load(Perl),