diff --git a/llvm/lib/TextAPI/ELF/TBEHandler.cpp b/llvm/lib/TextAPI/ELF/TBEHandler.cpp
index dde9802..b621829 100644
--- a/llvm/lib/TextAPI/ELF/TBEHandler.cpp
+++ b/llvm/lib/TextAPI/ELF/TBEHandler.cpp
@@ -105,6 +105,7 @@
       IO.mapRequired("Size", Symbol.Size);
     }
     IO.mapOptional("Undefined", Symbol.Undefined, false);
+    IO.mapOptional("Weak", Symbol.Weak, false);
     IO.mapOptional("Warning", Symbol.Warning);
   }