diff --git a/main.cc b/main.cc
index fa7479cd..bb0dc550 100644
--- a/main.cc
+++ b/main.cc
@@ -113,38 +113,6 @@ static std::vector<ArrayRef<T>> split(const std::vector<T> &input, int unit) {
   return vec;
 }
 
-static ObjectFile *create_internal_file() {
-  // Create a dummy object file.
-  static char buf[256];
-  std::unique_ptr<MemoryBuffer> mb =
-    MemoryBuffer::getMemBuffer(StringRef(buf, sizeof(buf)));
-  auto *obj = new ObjectFile(mb->getMemBufferRef(), "");
-  obj->name = "<internal>";
-  mb.release();
-
-  // Create linker-synthesized symbols.
-  auto *elf_syms = new std::vector<ELF64LE::Sym>;
-
-  auto create = [&](StringRef name) {
-    Symbol *sym = Symbol::intern(name);
-    sym->file = obj;
-    obj->symbols.push_back(sym);
-
-    ELF64LE::Sym esym = {};
-    esym.setType(STT_NOTYPE);
-    esym.setBinding(STB_GLOBAL);
-    elf_syms->push_back(esym);
-    return sym;
-  };
-
-  out::__bss_start = create("__bss_start");
-  out::__ehdr_start = create("__ehdr_start");
-  out::__rela_iplt_start = create("__rela_iplt_start");
-  out::__rela_iplt_end = create("__rela_iplt_end");
-  obj->elf_syms = *elf_syms;
-  return obj;
-}
-
 static void bin_sections(std::vector<ObjectFile *> &files) {
 #if 1
   int unit = (files.size() + 127) / 128;
@@ -559,7 +527,9 @@ int main(int argc, char **argv) {
     for_each(files, [](ObjectFile *file) { file->hanlde_undefined_weak_symbols(); });
   }
 
-  files.push_back(create_internal_file());
+  // Create a dummy file containing linker-synthesized symbols
+  // (e.g. `__bss_start`).
+  files.push_back(ObjectFile::create_internal_file());
 
   // Eliminate duplicate comdat groups.
   {
diff --git a/mold.h b/mold.h
index fdcf7801..d72698ab 100644
--- a/mold.h
+++ b/mold.h
@@ -535,6 +535,8 @@ public:
 
   bool is_in_archive();
 
+  static ObjectFile *create_internal_file();
+
   std::vector<InputSection *> sections;
   StringRef archive_name;
   ELFFile<ELF64LE> obj;
diff --git a/object_file.cc b/object_file.cc
index 26599514..1f2c34a4 100644
--- a/object_file.cc
+++ b/object_file.cc
@@ -421,6 +421,40 @@ bool ObjectFile::is_in_archive() {
   return !archive_name.empty();
 }
 
+ObjectFile *ObjectFile::create_internal_file() {
+  // Create a dummy object file.
+  constexpr int bufsz = 256;
+  char *buf = new char[bufsz];
+  std::unique_ptr<MemoryBuffer> mb =
+    MemoryBuffer::getMemBuffer(StringRef(buf, bufsz));
+
+  auto *obj = new ObjectFile(mb->getMemBufferRef(), "");
+  obj->name = "<internal>";
+  mb.release();
+
+  // Create linker-synthesized symbols.
+  auto *elf_syms = new std::vector<ELF64LE::Sym>;
+  obj->elf_syms = *elf_syms;
+
+  auto add = [&](StringRef name) {
+    Symbol *sym = Symbol::intern(name);
+    sym->file = obj;
+    obj->symbols.push_back(sym);
+
+    ELF64LE::Sym esym = {};
+    esym.setType(STT_NOTYPE);
+    esym.setBinding(STB_GLOBAL);
+    elf_syms->push_back(esym);
+    return sym;
+  };
+
+  out::__bss_start = add("__bss_start");
+  out::__ehdr_start = add("__ehdr_start");
+  out::__rela_iplt_start = add("__rela_iplt_start");
+  out::__rela_iplt_end = add("__rela_iplt_end");
+  return obj;
+}
+
 std::string toString(ObjectFile *obj) {
   StringRef s = obj->name;
   if (obj->archive_name == "")