1 files changed, 11 insertions, 5 deletions
diff --git a/src/liballoc_jemalloc/build.rs b/src/liballoc_jemalloc/build.rs
index 50149dfd65f..fc849e7a50c 100644
--- a/src/liballoc_jemalloc/build.rs
+++ b/src/liballoc_jemalloc/build.rs
@@ -151,11 +151,17 @@ fn main() {
     cmd.arg(format!("--build={}", build_helper::gnu_target(&host)));
 
     run(&mut cmd);
-    run(Command::new("make")
-        .current_dir(&build_dir)
-        .arg("build_lib_static")
-        .arg("-j")
-        .arg(env::var("NUM_JOBS").expect("NUM_JOBS was not set")));
+    let mut make = Command::new("make");
+    make.current_dir(&build_dir)
+        .arg("build_lib_static");
+
+    // mingw make seems... buggy? unclear...
+    if !host.contains("windows") {
+        make.arg("-j")
+            .arg(env::var("NUM_JOBS").expect("NUM_JOBS was not set"));
+    }
+
+    run(&mut make);
 
     if target.contains("windows") {
         println!("cargo:rustc-link-lib=static=jemalloc");