diff --git a/OutOfProcessExtractor.cs b/OutOfProcessExtractor.cs
index 91f2432..9f4b59f 100644
--- a/OutOfProcessExtractor.cs
+++ b/OutOfProcessExtractor.cs
@@ -395,7 +395,7 @@ private void RunMSBuild(string binlogPath)
                 };
                 foreach (var varName in dotnetSdkVarsToClean)
                 {
-                    startInfo.Environment[varName] = "";
+                    startInfo.Environment.Remove(varName);
                 }
             }
             else