diff --git a/clang-tools-extra/test/modularize/NoProblemsList.modularize b/clang-tools-extra/test/modularize/NoProblemsList.modularize
index ec5f4c9e5fc7..1951fd5b2676 100644
--- a/clang-tools-extra/test/modularize/NoProblemsList.modularize
+++ b/clang-tools-extra/test/modularize/NoProblemsList.modularize
@@ -1,2 +1,2 @@
 # RUN: modularize NoProblems.modularize,NoProblemsAnonymous.modularize -x c++
-# RUN: modularize -prefix=%p NoProblems.modularize,NoProblemsAnonymous.modularize -x c++
+# RUN: modularize -prefix=%p %S/NoProblems.modularize,%S/NoProblemsAnonymous.modularize -x c++