diff --git a/mold.h b/mold.h
index eb81bdd6..5f32ebee 100644
--- a/mold.h
+++ b/mold.h
@@ -259,7 +259,11 @@ public:
 // Program header
 class OutputPhdr : public OutputChunk {
 public:
-  void copy_to(uint8_t *buf) override;
+  void copy_to(uint8_t *buf) override {
+    auto *p = (ELF64LE::Phdr *)(buf + offset);
+    for (Phdr &ent : entries)
+      *p++ = ent.phdr;
+  }
 
   uint64_t get_size() const override {
     return entries.size() * sizeof(ELF64LE::Phdr);
diff --git a/output_chunks.cc b/output_chunks.cc
index cf75ebf3..6df5b98a 100644
--- a/output_chunks.cc
+++ b/output_chunks.cc
@@ -33,12 +33,6 @@ void OutputEhdr::relocate(uint8_t *buf) {
   hdr->e_shstrndx = out::shstrtab->index;
 }
 
-void OutputPhdr::copy_to(uint8_t *buf) {
-  auto *p = (ELF64LE::Phdr *)buf;
-  for (Phdr &ent : entries)
-    *p++ = ent.phdr;
-}
-
 static uint32_t to_phdr_flags(uint64_t sh_flags) {
   uint32_t ret = PF_R;
   if (sh_flags & SHF_WRITE)