diff --git a/csharp/src/AddressBook/AddressBook.csproj b/csharp/src/AddressBook/AddressBook.csproj
index 52b82a8ffe..f7e0d6be2d 100644
--- a/csharp/src/AddressBook/AddressBook.csproj
+++ b/csharp/src/AddressBook/AddressBook.csproj
@@ -24,7 +24,6 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
   </PropertyGroup>
@@ -36,7 +35,6 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
   </PropertyGroup>
diff --git a/csharp/src/ProtoBench/ProtoBench.csproj b/csharp/src/ProtoBench/ProtoBench.csproj
index 280a54a901..beee3a7196 100644
--- a/csharp/src/ProtoBench/ProtoBench.csproj
+++ b/csharp/src/ProtoBench/ProtoBench.csproj
@@ -23,7 +23,6 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
   </PropertyGroup>
@@ -35,7 +34,6 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
   </PropertyGroup>
diff --git a/csharp/src/ProtoDump/ProtoDump.csproj b/csharp/src/ProtoDump/ProtoDump.csproj
index 506d316b42..b7e6c1a338 100644
--- a/csharp/src/ProtoDump/ProtoDump.csproj
+++ b/csharp/src/ProtoDump/ProtoDump.csproj
@@ -25,7 +25,6 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
   </PropertyGroup>
@@ -37,7 +36,6 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
   </PropertyGroup>
diff --git a/csharp/src/ProtoMunge/ProtoMunge.csproj b/csharp/src/ProtoMunge/ProtoMunge.csproj
index 7be2b3f721..60c907b188 100644
--- a/csharp/src/ProtoMunge/ProtoMunge.csproj
+++ b/csharp/src/ProtoMunge/ProtoMunge.csproj
@@ -25,7 +25,6 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
   </PropertyGroup>
@@ -37,7 +36,6 @@
     <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
   </PropertyGroup>
diff --git a/csharp/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj b/csharp/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj
index 545725e34c..76bfcab34a 100644
--- a/csharp/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj
+++ b/csharp/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj
@@ -29,7 +29,6 @@
     <DefineConstants>DEBUG;TRACE;$(EnvironmentFlavor);$(EnvironmentTemplate)</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
     <Prefer32Bit>false</Prefer32Bit>
@@ -42,7 +41,6 @@
     <DefineConstants>TRACE;$(EnvironmentFlavor);$(EnvironmentTemplate)</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
     <Prefer32Bit>false</Prefer32Bit>
diff --git a/csharp/src/ProtocolBuffersLite.Test/ProtocolBuffersLite.Test.csproj b/csharp/src/ProtocolBuffersLite.Test/ProtocolBuffersLite.Test.csproj
index 75a1449957..4d813f83c4 100644
--- a/csharp/src/ProtocolBuffersLite.Test/ProtocolBuffersLite.Test.csproj
+++ b/csharp/src/ProtocolBuffersLite.Test/ProtocolBuffersLite.Test.csproj
@@ -29,7 +29,6 @@
     <DefineConstants>DEBUG;TRACE;$(EnvironmentFlavor);$(EnvironmentTemplate)</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
     <Prefer32Bit>false</Prefer32Bit>
@@ -42,7 +41,6 @@
     <DefineConstants>TRACE;$(EnvironmentFlavor);$(EnvironmentTemplate)</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
     <Prefer32Bit>false</Prefer32Bit>
diff --git a/csharp/src/ProtocolBuffersLite.Test/ProtocolBuffersLiteMixed.Test.csproj b/csharp/src/ProtocolBuffersLite.Test/ProtocolBuffersLiteMixed.Test.csproj
index 11109223b8..c42ab93c25 100644
--- a/csharp/src/ProtocolBuffersLite.Test/ProtocolBuffersLiteMixed.Test.csproj
+++ b/csharp/src/ProtocolBuffersLite.Test/ProtocolBuffersLiteMixed.Test.csproj
@@ -27,7 +27,6 @@
     <DefineConstants>DEBUG;TRACE;$(EnvironmentFlavor);$(EnvironmentTemplate)</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
     <Prefer32Bit>false</Prefer32Bit>
@@ -40,7 +39,6 @@
     <DefineConstants>TRACE;$(EnvironmentFlavor);$(EnvironmentTemplate)</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoStdLib>true</NoStdLib>
     <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
     <Prefer32Bit>false</Prefer32Bit>