diff --git a/cmake/QtBuild.cmake b/cmake/QtBuild.cmake
index 5a3577d1619..d13b160e364 100644
--- a/cmake/QtBuild.cmake
+++ b/cmake/QtBuild.cmake
@@ -2270,6 +2270,7 @@ function(add_qt_test name)
 
         if (builtin_files)
             add_qt_resource(${name} "testdata"
+                PREFIX "/"
                 FILES ${builtin_files}
                 BASE ${CMAKE_CURRENT_SOURCE_DIR})
         endif()