diff --git a/src/Xamarin.Android.Build.Tasks/Tests/Xamarin.ProjectTools/Common/Builder.cs b/src/Xamarin.Android.Build.Tasks/Tests/Xamarin.ProjectTools/Common/Builder.cs
index c19ce880c67..397c70fe3e8 100644
--- a/src/Xamarin.Android.Build.Tasks/Tests/Xamarin.ProjectTools/Common/Builder.cs
+++ b/src/Xamarin.Android.Build.Tasks/Tests/Xamarin.ProjectTools/Common/Builder.cs
@@ -360,7 +360,8 @@ protected bool BuildInternal (string projectOrSolution, string target, string []
 
 			if (buildLogFullPath != null && processLog != null) {
 				Directory.CreateDirectory (Path.GetDirectoryName (buildLogFullPath));
-				File.AppendAllText (buildLogFullPath, File.ReadAllText (processLog));
+				if (File.Exists (processLog))
+					File.AppendAllText (buildLogFullPath, File.ReadAllText (processLog));
 			}
 			if (!result && ThrowOnBuildFailure) {
 				string message = "Build failure: " + Path.GetFileName (projectOrSolution) + (BuildLogFile != null && File.Exists (buildLogFullPath) ? "Build log recorded at " + buildLogFullPath : null);