diff --git a/clang/lib/AST/StmtProfile.cpp b/clang/lib/AST/StmtProfile.cpp
index df49e84..214378a97 100644
--- a/clang/lib/AST/StmtProfile.cpp
+++ b/clang/lib/AST/StmtProfile.cpp
@@ -470,6 +470,7 @@
 
 void StmtProfiler::VisitAtomicExpr(const AtomicExpr *S) {
   VisitExpr(S);
+  ID.AddInteger(S->getOp());
 }
 
 static Stmt::StmtClass DecodeOperatorCall(const CXXOperatorCallExpr *S,