diff --git a/DownloadBoost.cmake b/DownloadBoost.cmake
index 76fc5728bbcbd792400f98b811825935152fd0cf..c354b8f4cdefa0120e75f35452dab111ef260b00 100644
--- a/DownloadBoost.cmake
+++ b/DownloadBoost.cmake
@@ -41,10 +41,10 @@ FetchContent_Populate(boost)
 # Build Boost #
 ###############
 set(BOOTSTRAP_CMD sh bootstrap.sh)
-set(B2_CMD ./b2 ${PARALLEL_BUILD_FLAG}${N_CORES})
+set(B2_CMD ./b2 -j${N_CORES})
 if(WIN32)
     set(BOOTSTRAP_CMD bootstrap.bat)
-    set(B2_CMD b2 ${PARALLEL_BUILD_FLAG}${N_CORES})
+    set(B2_CMD b2 -j${N_CORES})
 endif()
 
 execute_process(