Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -5794,7 +5794,7 @@
   Group<f_Group>, CodeGenOpts<"EnableAssignmentTracking">,
   NormalizedValuesScope<"CodeGenOptions::AssignmentTrackingOpts">,
   Values<"disabled,enabled,forced">, NormalizedValues<["Disabled","Enabled","Forced"]>,
-  MarshallingInfoEnum<CodeGenOpts<"AssignmentTrackingMode">, "Disabled">;
+  MarshallingInfoEnum<CodeGenOpts<"AssignmentTrackingMode">, "Enabled">;
 
 } // let Flags = [CC1Option, NoDriverOption]
 
Index: clang/test/CodeGen/assignment-tracking/flag.cpp
===================================================================
--- clang/test/CodeGen/assignment-tracking/flag.cpp
+++ clang/test/CodeGen/assignment-tracking/flag.cpp
@@ -8,10 +8,10 @@
 // RUN:     -emit-llvm  %s -o - -fexperimental-assignment-tracking=disabled -O1\
 // RUN: | FileCheck %s --check-prefixes=DISABLE
 
-//// Disabled by default:
+//// Enabled by default:
 // RUN: %clang_cc1 -triple x86_64-none-linux-gnu -debug-info-kind=standalone   \
 // RUN:     -emit-llvm  %s -o - -O1                                            \
-// RUN: | FileCheck %s --check-prefixes=DISABLE
+// RUN: | FileCheck %s --check-prefixes=ENABLE
 
 //// Disabled at O0 unless forced.
 // RUN: %clang_cc1 -triple x86_64-none-linux-gnu -debug-info-kind=standalone   \