diff --git a/buildtools/fslex/fslex.fsproj b/buildtools/fslex/fslex.fsproj
index 5dfef2f0e31..b450de1668d 100644
--- a/buildtools/fslex/fslex.fsproj
+++ b/buildtools/fslex/fslex.fsproj
@@ -5,6 +5,7 @@
     <TargetFramework>$(FSharpNetCoreProductTargetFramework)</TargetFramework>
     <DisableImplicitFSharpCoreReference>true</DisableImplicitFSharpCoreReference>
     <RollForward Condition="'$(BUILDING_USING_DOTNET)' == 'true'">LatestMajor</RollForward>
+    <NoWarn>$(NoWarn);64;1182;1204</NoWarn>         <!--Temporary fix for sourcebuild -->
   </PropertyGroup>
 
   <PropertyGroup>
diff --git a/buildtools/fsyacc/fsyacc.fsproj b/buildtools/fsyacc/fsyacc.fsproj
index 1ff8a110759..5f97b762e03 100644
--- a/buildtools/fsyacc/fsyacc.fsproj
+++ b/buildtools/fsyacc/fsyacc.fsproj
@@ -5,6 +5,7 @@
     <TargetFramework>$(FSharpNetCoreProductTargetFramework)</TargetFramework>
     <DisableImplicitFSharpCoreReference>true</DisableImplicitFSharpCoreReference>
     <RollForward Condition="'$(BUILDING_USING_DOTNET)' == 'true'">LatestMajor</RollForward>
+    <NoWarn>$(NoWarn);64;1182;1204</NoWarn>         <!--Temporary fix for sourcebuild -->
   </PropertyGroup>
 
   <PropertyGroup>
diff --git a/src/Compiler/FSharp.Compiler.Service.fsproj b/src/Compiler/FSharp.Compiler.Service.fsproj
index 36b184502f1..cf3e820b879 100644
--- a/src/Compiler/FSharp.Compiler.Service.fsproj
+++ b/src/Compiler/FSharp.Compiler.Service.fsproj
@@ -10,6 +10,8 @@
     <NoWarn>$(NoWarn);75</NoWarn> <!-- InternalCommandLineOption -->
     <NoWarn>$(NoWarn);1204</NoWarn> <!-- This construct is for use in the FSharp.Core library and should not be used directly -->
     <NoWarn>$(NoWarn);NU5125</NoWarn>
+    <NoWarn>$(NoWarn);64;1182;1204</NoWarn>         <!--Temporary fix for sourcebuild -->
+    <OtherFlags>$(OtherFlags) --warnaserror-:1182</OtherFlags>         <!--Temporary fix for sourcebuild -->
     <AssemblyName>FSharp.Compiler.Service</AssemblyName>
     <AllowCrossTargeting>true</AllowCrossTargeting>
     <DefineConstants>$(DefineConstants);COMPILER</DefineConstants>