diff --git a/ports/windows/msvc/common.props b/ports/windows/msvc/common.props
index 26ea78e7e5..5fe1b45fef 100644
--- a/ports/windows/msvc/common.props
+++ b/ports/windows/msvc/common.props
@@ -18,6 +18,7 @@
       <ExceptionHandling>false</ExceptionHandling>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <MinimalRebuild>false</MinimalRebuild>
+      <TreatWarningAsError>true</TreatWarningAsError>
     </ClCompile>
     <Link>
       <GenerateDebugInformation>true</GenerateDebugInformation>