diff --git a/build.bat b/build.bat
index b4f3420e1404e372da4bc49323cc07faf6bb87b1..6ada61cab2b4a21311fd85b765a8bb73a0a74294 100644
--- a/build.bat
+++ b/build.bat
@@ -20,7 +20,11 @@ IF NOT %errorlevel% == 0 (
     goto run_fail
     )
  
-cmake --build . --target all -- -j6
+IF "%1%" == "" (
+    cmake --build . --target all -- -j6
+    ) ELSE (
+        cmake --build . --target all -- -j%1%
+    )
 IF NOT %errorlevel% == 0 (
     goto run_fail
     )