diff --git a/plugins/python/python3.vcxproj b/plugins/python/python3.vcxproj
index 9e5d223a..49856e37 100644
--- a/plugins/python/python3.vcxproj
+++ b/plugins/python/python3.vcxproj
@@ -30,7 +30,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;PYTHON_EXPORTS;Py_NO_LINK_LIB;$(OwnFlags);%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <UndefinePreprocessorDefinitions>Py_REF_DEBUG;Py_TRACE_REFS;%(UndefinePreprocessorDefinitions)</UndefinePreprocessorDefinitions>
+      <UndefinePreprocessorDefinitions>_DEBUG;Py_DEBUG;Py_REF_DEBUG;Py_TRACE_REFS;%(UndefinePreprocessorDefinitions)</UndefinePreprocessorDefinitions>
       <AdditionalIncludeDirectories>$(Glib);$(Python3Path)\include;..\..\src\common;$(ZoiteChatLib);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
@@ -45,7 +45,7 @@
    <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
       <PreprocessorDefinitions>WIN32;_WIN64;_AMD64_;NDEBUG;_WINDOWS;_USRDLL;PYTHON_EXPORTS;Py_NO_LINK_LIB;$(OwnFlags);%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <UndefinePreprocessorDefinitions>Py_REF_DEBUG;Py_TRACE_REFS;%(UndefinePreprocessorDefinitions)</UndefinePreprocessorDefinitions>
+      <UndefinePreprocessorDefinitions>_DEBUG;Py_DEBUG;Py_REF_DEBUG;Py_TRACE_REFS;%(UndefinePreprocessorDefinitions)</UndefinePreprocessorDefinitions>
       <AdditionalIncludeDirectories>$(Glib);$(Python3Path)\include;..\..\src\common;$(ZoiteChatLib);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
@@ -72,3 +72,4 @@
 </Project>
 
 
+