diff --git a/vendor/CMakeLists.txt b/vendor/CMakeLists.txt
index 054fe93..e5b9225 100644
--- a/vendor/CMakeLists.txt
+++ b/vendor/CMakeLists.txt
@@ -8,7 +8,7 @@ ExternalProject_Add(OpenSSL PREFIX openssl
         URL_MD5 5271477e4d93f4ea032b665ef095ff24
         CONFIGURE_COMMAND ./Configure linux-x86_64 --prefix=<INSTALL_DIR> --openssldir=<INSTALL_DIR>/lib/ssl
         no-weak-ssl-ciphers enable-ec_nistp_64_gcc_128 no-shared
-		INSTALL_COMMAND make install_sw
+		INSTALL_COMMAND make -j1 install_sw
         BUILD_IN_SOURCE 1)
 
 ExternalProject_Get_Property(OpenSSL INSTALL_DIR)