diff --git a/source/build/Octopus.Tfs.targets b/source/build/Octopus.Tfs.targets
index fc86811..5052fae 100644
--- a/source/build/Octopus.Tfs.targets
+++ b/source/build/Octopus.Tfs.targets
@@ -1,6 +1,6 @@
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 
   <!-- Ensure that the Variables.targets file is loaded to get/set appropriate OctoPack variables. -->
-  <Import Project="$(SolutionDir)\.deploy\Variables.targets" />
+  <Import Project="$(SolutionDir)\.deploy\Variables.targets" Condition="'$(SolutionDir)' != ''" />
 
-</Project>
\ No newline at end of file
+</Project>