diff --git a/runtime/oat.h b/runtime/oat.h
index 120de6d..de95fef 100644
--- a/runtime/oat.h
+++ b/runtime/oat.h
@@ -156,6 +156,8 @@
 
   ~OatMethodOffsets();
 
+  OatMethodOffsets& operator=(const OatMethodOffsets&) = default;
+
   uint32_t code_offset_;
 };
 
@@ -169,6 +171,8 @@
 
   ~OatQuickMethodHeader();
 
+  OatQuickMethodHeader& operator=(const OatQuickMethodHeader&) = default;
+
   // The offset in bytes from the start of the mapping table to the end of the header.
   uint32_t mapping_table_offset_;
   // The offset in bytes from the start of the vmap table to the end of the header.