diff --git a/src/wasi_libc.zig b/src/wasi_libc.zig
index 3a4a3aca07ba4a065ba0bb307d0f2a6e1f85b9e8..7a52ea030e627b88b18df96929af5bfa3931b5c6 100644
--- a/src/wasi_libc.zig
+++ b/src/wasi_libc.zig
@@ -277,6 +277,8 @@ fn addCCArgs(
 
         "-iwithsysroot",
         try comp.zig_lib_directory.join(arena, &[_][]const u8{ "libc", "include", triple }),
+
+        "-DBULK_MEMORY_THRESHOLD=32",
     });
 }