diff --git a/macho/input-sections.cc b/macho/input-sections.cc
index 4d12102c..6d60e8ca 100644
--- a/macho/input-sections.cc
+++ b/macho/input-sections.cc
@@ -6,6 +6,14 @@ InputSection::InputSection(Context &ctx, ObjectFile &file, const MachSection &hd
   : file(file), hdr(hdr) {
   contents = file.mf->get_contents().substr(hdr.offset, hdr.size);
   subsections.push_back({*this, 0, (u32)contents.size()});
+
+  rels.reserve(hdr.nreloc);
+
+  MachRel *rel = (MachRel *)(file.mf->data + hdr.reloff);
+  for (i64 i = 0; i < hdr.nreloc; i++) {
+    MachRel r = rel[i];
+    rels.push_back({r.offset, r.type});
+  }
 }
 
 } // namespace mold::macho
diff --git a/macho/mold.h b/macho/mold.h
index 4e54c823..4d910ba2 100644
--- a/macho/mold.h
+++ b/macho/mold.h
@@ -39,11 +39,11 @@ std::ostream &operator<<(std::ostream &out, const ObjectFile &file);
 //
 
 struct Relocation {
-  u32 offset;
-  u32 type;
-  Symbol *sym;
-  Subsection *subsec;
-  u64 addend;
+  u32 offset = 0;
+  u32 type = 0;
+  Symbol *sym = nullptr;
+  Subsection *subsec = nullptr;
+  u64 addend = 0;
 };
 
 class InputSection {