diff --git a/tests/testsuite/standard_lib.rs b/tests/testsuite/standard_lib.rs
index 47079ee8b0f..7c56e5523af 100644
--- a/tests/testsuite/standard_lib.rs
+++ b/tests/testsuite/standard_lib.rs
@@ -264,7 +264,7 @@ fn shared_std_dependency_rebuild() {
                 [build-dependencies]
                 dep_test = {{ path = \"{}/tests/testsuite/mock-std/dep_test\" }}
             ",
-                manifest_dir
+                manifest_dir.replace('\\', "/")
             )
             .as_str(),
         )