diff --git a/.drone.yml b/.drone.yml
index c847719d..33c3ac7c 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -282,7 +282,7 @@ steps:
   environment:
     CC: clang-9
     CXX: clang++-9
-    BUILD_FLAGS: -- -j
+    BUILD_FLAGS: -- -j 4
     CMAKE_FLAGS: -GNinja -DSIMDJSON_BUILD_STATIC=ON
     CTEST_FLAGS: -j4 --output-on-failure
     CXXFLAGS: -stdlib=libc++