diff --git a/libdd-common/src/test_utils.rs b/libdd-common/src/test_utils.rs
index b422fee461..01c1c208ee 100644
--- a/libdd-common/src/test_utils.rs
+++ b/libdd-common/src/test_utils.rs
@@ -514,6 +514,11 @@ mod tests {
         assert_eq!(parsed.multipart_parts[0].name, "field");
         assert_eq!(parsed.multipart_parts[0].content, b"value");
     }
+}
+
+#[cfg(test)]
+mod single_threaded_tests {
+    use crate::test_utils::count_active_threads;
 
     #[test]
     #[cfg_attr(miri, ignore)]