diff --git a/clang/Lex/IdentifierTable.cpp b/clang/Lex/IdentifierTable.cpp
index 4c6516df2d38..c12fdef20305 100644
--- a/clang/Lex/IdentifierTable.cpp
+++ b/clang/Lex/IdentifierTable.cpp
@@ -31,6 +31,7 @@ IdentifierInfo::IdentifierInfo() {
   IsPoisoned = false;
   IsOtherTargetMacro = false;
   IsCPPOperatorKeyword = false;
+  IsNonPortableBuiltin = false;
   FETokenInfo = 0;
 }