diff --git a/mold.h b/mold.h
index 4591acb9..7efae7ae 100644
--- a/mold.h
+++ b/mold.h
@@ -676,12 +676,12 @@ struct ComdatGroup {
 
 class InputFile {
 public:
-  InputFile(MemoryBufferRef mb)
-    : mb(mb), name(mb.getBufferIdentifier()),
+  InputFile(MemoryBufferRef mb, bool is_dso)
+    : mb(mb), name(mb.getBufferIdentifier()), is_dso(is_dso),
       obj(check(ELFFile<ELF64LE>::create(mb.getBuffer()))) {}
 
   std::string name;
-  bool is_dso = false;
+  bool is_dso;
   u32 priority;
   MemoryBufferRef mb;
   ELFFile<ELF64LE> obj;
@@ -743,9 +743,7 @@ private:
 
 class SharedFile : public InputFile {
 public:
-  SharedFile(MemoryBufferRef mb) : InputFile(mb) {
-    is_dso = true;
-  }
+  SharedFile(MemoryBufferRef mb) : InputFile(mb, true) {}
 
   void parse();
   void resolve_symbols();
diff --git a/object_file.cc b/object_file.cc
index 1abe3a37..a4c68c9d 100644
--- a/object_file.cc
+++ b/object_file.cc
@@ -12,7 +12,7 @@ using namespace llvm;
 using namespace llvm::ELF;
 
 ObjectFile::ObjectFile(MemoryBufferRef mb, StringRef archive_name)
-  : InputFile(mb), archive_name(archive_name),
+  : InputFile(mb, false), archive_name(archive_name),
     is_in_archive(archive_name != "") {
   is_alive = (archive_name == "");
 }