diff --git a/dll.vcxproj b/dll.vcxproj
index 44c71646..2866a857 100644
--- a/dll.vcxproj
+++ b/dll.vcxproj
@@ -79,7 +79,7 @@
     <ClCompile>
       <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;LIBMDBX_EXPORTS;%(PreprocessorDefinitions);MDBX_DEBUG=1</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <Optimization>Disabled</Optimization>
       <StringPooling>true</StringPooling>
@@ -120,7 +120,7 @@
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <ClCompile>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <PreprocessorDefinitions>WIN64;_DEBUG;_WINDOWS;_USRDLL;LIBMDBX_EXPORTS;%(PreprocessorDefinitions);MDBX_DEBUG=1</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
       <StringPooling>true</StringPooling>
diff --git a/test/test.vcxproj b/test/test.vcxproj
index 6676ffc0..400090b5 100644
--- a/test/test.vcxproj
+++ b/test/test.vcxproj
@@ -93,7 +93,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;MDBX_DEBUG=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <SDLCheck>true</SDLCheck>
@@ -108,7 +108,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>_DEBUG;_CONSOLE;MDBX_DEBUG=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <SDLCheck>true</SDLCheck>