diff --git a/libc/utils/gpu/loader/Loader.h b/libc/utils/gpu/loader/Loader.h
index fd558a33b960..8722f5917582 100644
--- a/libc/utils/gpu/loader/Loader.h
+++ b/libc/utils/gpu/loader/Loader.h
@@ -85,7 +85,7 @@ void *copy_argument_vector(int argc, const char **argv, Allocator alloc) {
   }
 
   // Ensure the vector is null terminated.
-  reinterpret_cast<void **>(dev_argv)[argc + 1] = nullptr;
+  reinterpret_cast<void **>(dev_argv)[argc] = nullptr;
   return dev_argv;
 }