diff --git a/PowerEditor/visual.net/notepadPlus.vcxproj b/PowerEditor/visual.net/notepadPlus.vcxproj
index d2c3fb49..84c11ca7 100755
--- a/PowerEditor/visual.net/notepadPlus.vcxproj
+++ b/PowerEditor/visual.net/notepadPlus.vcxproj
@@ -226,7 +226,7 @@ copy ..\src\contextMenu.xml ..\bin\contextMenu.xml
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <WarningLevel>Level4</WarningLevel>
-      <TreatWarningAsError>false</TreatWarningAsError>
+      <TreatWarningAsError>true</TreatWarningAsError>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <EnableEnhancedInstructionSet>NoExtensions</EnableEnhancedInstructionSet>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>