diff --git a/PCbuild/build.bat b/PCbuild/build.bat
index 60235704886..e4de9a80d76 100644
--- a/PCbuild/build.bat
+++ b/PCbuild/build.bat
@@ -41,6 +41,7 @@ echo.  --experimental-jit-off      Ditto but off by default (PYTHON_JIT=1 enable
 echo.  --experimental-jit-interpreter  Enable the experimental Tier 2 interpreter.
 echo.  --pystats      Enable PyStats collection.
 echo.  --tail-call-interp  Enable tail-calling interpreter (requires LLVM 19 or higher).
+echo.  --enable-stackref-debug  Enable stackref debugging mode.
 echo.
 echo.Available flags to avoid building certain modules.
 echo.These flags have no effect if '-e' is not given:
@@ -98,6 +99,7 @@ if "%~1"=="--experimental-jit-interpreter-off" (set UseTIER2=6) & shift & goto C
 if "%~1"=="--without-remote-debug" (set DisableRemoteDebug=true) & shift & goto CheckOpts
 if "%~1"=="--pystats" (set PyStats=1) & shift & goto CheckOpts
 if "%~1"=="--tail-call-interp" (set UseTailCallInterp=true) & shift & goto CheckOpts
+if "%~1"=="--enable-stackref-debug" (set StackRefDebug=true) & shift & goto CheckOpts
 rem These use the actual property names used by MSBuild.  We could just let
 rem them in through the environment, but we specify them on the command line
 rem anyway for visibility so set defaults after this
@@ -202,6 +204,7 @@ echo on
  /p:PyStats=%PyStats%^
  /p:UseTailCallInterp=%UseTailCallInterp%^
  /p:DisableRemoteDebug=%DisableRemoteDebug%^
+ /p:StackRefDebug=%StackRefDebug%^
  %1 %2 %3 %4 %5 %6 %7 %8 %9
 
 @echo off
diff --git a/PCbuild/pythoncore.vcxproj b/PCbuild/pythoncore.vcxproj
index 359a47fbfc4..85363949c23 100644
--- a/PCbuild/pythoncore.vcxproj
+++ b/PCbuild/pythoncore.vcxproj
@@ -110,6 +110,7 @@
       <PreprocessorDefinitions Condition="'$(UseTailCallInterp)' == 'true'">_Py_TAIL_CALL_INTERP=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(WITH_COMPUTED_GOTOS)' != ''">HAVE_COMPUTED_GOTOS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(DisableRemoteDebug)' != 'true'">Py_REMOTE_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions Condition="'$(StackRefDebug)' == 'true'">Py_STACKREF_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
     <Link>
       <AdditionalDependencies>version.lib;ws2_32.lib;pathcch.lib;bcrypt.lib;%(AdditionalDependencies)</AdditionalDependencies>