1 files changed, 1 insertions, 1 deletions

diff --git a/src/WixBuildTools.TestSupport/MsbuildRunner.cs b/src/WixBuildTools.TestSupport/MsbuildRunner.cs
index 953ed654..97e49d6f 100644
--- a/src/WixBuildTools.TestSupport/MsbuildRunner.cs
+++ b/src/WixBuildTools.TestSupport/MsbuildRunner.cs
@@ -65,7 +65,7 @@ namespace WixBuildTools.TestSupport
                 }
             }
 
-            var msbuildPath = Msbuild15Path ?? Msbuild16Path;
+            var msbuildPath = !String.IsNullOrEmpty(Msbuild15Path) ? Msbuild15Path : Msbuild16Path;
 
             if (msbuildVersion == "15")
             {