diff --git a/v2/test/build_file.py b/v2/test/build_file.py
index 9f602001f..c046ac544 100644
--- a/v2/test/build_file.py
+++ b/v2/test/build_file.py
@@ -89,7 +89,7 @@ exe hello3 : hello3.cpp ;
     t.write("hello3.cpp", "int main() { return 0; }")
 
     t.run_build_system("hello1 " + t.adjust_suffix("hello2.obj"), status=1)
-    t.expect_output_line("don't know how to make*hello2.obj")
+    t.expect_output_line("don't know how to make*" + t.adjust_suffix("hello2.obj"))
     t.expect_nothing_more()
 
     t.cleanup()