diff --git a/linker/linker_phdr.cpp b/linker/linker_phdr.cpp
index cf1cfb3..a629ee6 100644
--- a/linker/linker_phdr.cpp
+++ b/linker/linker_phdr.cpp
@@ -228,8 +228,10 @@
     return false;
   }
 
+#if !defined(__LP64__)
   // Map at most 1MiB which should cover most cases
   map_size = std::min(map_size, static_cast<size_t>(1 * 1024 * 1024));
+#endif
 
   if (!file_fragment_.Map(fd_, file_offset_, 0, map_size)) {
     DL_ERR("\"%s\" header mmap failed: %s", name_.c_str(), strerror(errno));