diff --git a/.build/CBT/CBT.Core.dll b/.build/CBT/CBT.Core.dll
index e4fbdba..a5d8a76 100644
Binary files a/.build/CBT/CBT.Core.dll and b/.build/CBT/CBT.Core.dll differ
diff --git a/.build/CBT/build.props b/.build/CBT/build.props
index de71f53..d634e80 100644
--- a/.build/CBT/build.props
+++ b/.build/CBT/build.props
@@ -81,6 +81,8 @@
     <CBTModuleRestoreCommandArguments Condition=" '$(CBTModuleRestoreCommandAdditionalArguments)' != '' ">$(CBTModuleRestoreCommandArguments) $(CBTModuleRestoreCommandAdditionalArguments)</CBTModuleRestoreCommandArguments>
 
     <CBTModuleNuGetAssetsFlagFile Condition=" '$(CBTModuleNuGetAssetsFlagFile)' == '' ">$(CBTIntermediateOutputPath)\AssetsLockFilePath.flag</CBTModuleNuGetAssetsFlagFile>
+    <!-- ExcludeRestorePackageImports implies that we are running under a nuget.exe 4.x process and module restoration should be disabled. -->
+    <RestoreCBTModules Condition=" '$(ExcludeRestorePackageImports)' == 'true' ">false</RestoreCBTModules>
     <CBTModulesRestored Condition=" '$(RestoreCBTModules)' != 'false' And '$(BuildingInsideVisualStudio)' != 'true' And '$(CBTModulesRestored)' != 'true' And Exists('$(CBTCoreAssemblyPath)') ">$(CBTCoreAssemblyPath.GetType().Assembly.GetType('System.AppDomain').GetProperty('CurrentDomain').GetValue(null, null).CreateInstanceFromAndUnwrap($(CBTCoreAssemblyPath), $(CBTModuleRestoreTaskName)).Execute($(CBTModuleImportsAfter.Split(';')), $(CBTModuleImportsBefore.Split(';')), $(CBTModuleExtensionsPath), $(CBTModulePropertiesFile), $(CBTNuGetDownloaderAssemblyPath), $(CBTNuGetDownloaderClassName), '$(CBTNuGetDownloaderArguments)', $(CBTModuleRestoreInputs.Split(';')), $(CBTModulePackageConfigPath), $(NuGetPackagesPath), $(CBTPackagesFallbackPath), $(CBTModuleRestoreCommand), $(CBTModuleRestoreCommandArguments), $(MSBuildProjectFullPath), $(CBTModuleNuGetAssetsFlagFile)))</CBTModulesRestored>
 
   </PropertyGroup>
diff --git a/src/CBT.Core.UnitTests/BuildPropsTest.cs b/src/CBT.Core.UnitTests/BuildPropsTest.cs
index cf178b9..c6c3f71 100644
--- a/src/CBT.Core.UnitTests/BuildPropsTest.cs
+++ b/src/CBT.Core.UnitTests/BuildPropsTest.cs
@@ -61,6 +61,7 @@ public void RequiredPropertiesTest()
                 {new Property("CBTModuleRestoreCommandArguments", @"restore ""$(CBTModulePackageConfigPath)"" -NonInteractive", defaultCondition)},
                 {new Property("CBTModuleRestoreCommandArguments", @"$(CBTModuleRestoreCommandArguments) $(CBTModuleRestoreCommandAdditionalArguments)", @" '$(CBTModuleRestoreCommandAdditionalArguments)' != '' ")},
                 {new Property("CBTModuleNuGetAssetsFlagFile", @"$(CBTIntermediateOutputPath)\AssetsLockFilePath.flag", defaultCondition)},
+                {new Property("RestoreCBTModules", @"false", @" '$(ExcludeRestorePackageImports)' == 'true' ")},
                 {new Property("CBTModulesRestored", @"$(CBTCoreAssemblyPath.GetType().Assembly.GetType('System.AppDomain').GetProperty('CurrentDomain').GetValue(null, null).CreateInstanceFromAndUnwrap($(CBTCoreAssemblyPath), $(CBTModuleRestoreTaskName)).Execute($(CBTModuleImportsAfter.Split(';')), $(CBTModuleImportsBefore.Split(';')), $(CBTModuleExtensionsPath), $(CBTModulePropertiesFile), $(CBTNuGetDownloaderAssemblyPath), $(CBTNuGetDownloaderClassName), '$(CBTNuGetDownloaderArguments)', $(CBTModuleRestoreInputs.Split(';')), $(CBTModulePackageConfigPath), $(NuGetPackagesPath), $(CBTPackagesFallbackPath), $(CBTModuleRestoreCommand), $(CBTModuleRestoreCommandArguments), $(MSBuildProjectFullPath), $(CBTModuleNuGetAssetsFlagFile)))", @" '$(RestoreCBTModules)' != 'false' And '$(BuildingInsideVisualStudio)' != 'true' And '$(CBTModulesRestored)' != 'true' And Exists('$(CBTCoreAssemblyPath)') ")},
             };
             var propertiesToScan = _project.Properties.Where(p => p.Parent.Parent is ProjectRootElement);
diff --git a/src/CBT.Core/Tasks/RestoreModules.cs b/src/CBT.Core/Tasks/RestoreModules.cs
index 9638f45..efee21b 100644
--- a/src/CBT.Core/Tasks/RestoreModules.cs
+++ b/src/CBT.Core/Tasks/RestoreModules.cs
@@ -444,7 +444,7 @@ private bool RestorePackages()
                 },
             })
             {
-                process.StartInfo.EnvironmentVariables.Add("RestoreCBTModules", "false");
+                process.StartInfo.EnvironmentVariables["RestoreCBTModules"] = "false";
                 process.ErrorDataReceived += (sender, args) =>
                 {
                     if (!String.IsNullOrWhiteSpace(args?.Data))