diff --git a/clang/lib/CodeGen/CGClass.cpp b/clang/lib/CodeGen/CGClass.cpp
index 0f2422a6a665a..e7c704f9da188 100644
--- a/clang/lib/CodeGen/CGClass.cpp
+++ b/clang/lib/CodeGen/CGClass.cpp
@@ -2961,7 +2961,8 @@ void CodeGenFunction::EmitVTablePtrCheck(const CXXRecordDecl *RD,
   }
 
   if (CGM.getCodeGenOpts().SanitizeTrap.has(M)) {
-    EmitTrapCheck(TypeTest, SanitizerHandler::CFICheckFail);
+    bool NoMerge = !CGM.getCodeGenOpts().SanitizeMergeHandlers.has(M);
+    EmitTrapCheck(TypeTest, SanitizerHandler::CFICheckFail, NoMerge);
     return;
   }
 
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index 4d6e776f42660..93166ebcc3e79 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -3887,7 +3887,11 @@ void CodeGenFunction::EmitCfiCheckFail() {
   // Data == nullptr means the calling module has trap behaviour for this check.
   llvm::Value *DataIsNotNullPtr =
       Builder.CreateICmpNE(Data, llvm::ConstantPointerNull::get(Int8PtrTy));
-  EmitTrapCheck(DataIsNotNullPtr, SanitizerHandler::CFICheckFail);
+  // TODO: since there is no data, we don't know the CheckKind, and therefore
+  // cannot inspect CGM.getCodeGenOpts().SanitizeMergeHandlers. We default to
+  // NoMerge = false. Users can disable merging by disabling optimization.
+  EmitTrapCheck(DataIsNotNullPtr, SanitizerHandler::CFICheckFail,
+                /*NoMerge=*/false);
 
   llvm::StructType *SourceLocationTy =
       llvm::StructType::get(VoidPtrTy, Int32Ty, Int32Ty);
@@ -3926,7 +3930,11 @@ void CodeGenFunction::EmitCfiCheckFail() {
       EmitCheck(std::make_pair(Cond, Ordinal), SanitizerHandler::CFICheckFail,
                 {}, {Data, Addr, ValidVtable});
     else
-      EmitTrapCheck(Cond, SanitizerHandler::CFICheckFail);
+      // TODO: we can't rely on CGM.getCodeGenOpts().SanitizeMergeHandlers.
+      // Although the compiler allows SanitizeMergeHandlers to be set
+      // independently of CGM.getLangOpts().Sanitize, Driver/SanitizerArgs.cpp
+      // requires that SanitizeMergeHandlers is a subset of Sanitize.
+      EmitTrapCheck(Cond, SanitizerHandler::CFICheckFail, /*NoMerge=*/false);
   }
 
   FinishFunction();