diff --git a/include/llvm/Object/Archive.h b/include/llvm/Object/Archive.h
index 198491c3769..05595572dde 100644
--- a/include/llvm/Object/Archive.h
+++ b/include/llvm/Object/Archive.h
@@ -33,7 +33,8 @@ struct ArchiveMemberHeader {
   /// Get the name without looking up long names.
   llvm::StringRef getName() const;
 
-  uint64_t getSize() const;
+  /// Members are not larger than 4GB.
+  uint32_t getSize() const;
 };
 
 class Archive : public Binary {
diff --git a/lib/Object/Archive.cpp b/lib/Object/Archive.cpp
index 14b21fd6361..52578943dec 100644
--- a/lib/Object/Archive.cpp
+++ b/lib/Object/Archive.cpp
@@ -54,11 +54,11 @@ StringRef ArchiveMemberHeader::getName() const {
   return llvm::StringRef(Name, end);
 }
 
-uint64_t ArchiveMemberHeader::getSize() const {
-  uint64_t ret;
-  if (llvm::StringRef(Size, sizeof(Size)).rtrim(" ").getAsInteger(10, ret))
-    llvm_unreachable("Size is not an integer.");
-  return ret;
+uint32_t ArchiveMemberHeader::getSize() const {
+  uint32_t Ret;
+  if (llvm::StringRef(Size, sizeof(Size)).rtrim(" ").getAsInteger(10, Ret))
+    llvm_unreachable("Size is not a decimal number.");
+  return Ret;
 }
 
 static const ArchiveMemberHeader *toHeader(const char *base) {