diff --git a/.cargo/config.toml b/.cargo/config.toml
index 45b19005..799d69de 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -6,6 +6,7 @@ crates-io = "https://docs.rs/"
 
 [target.'cfg(all())']
 rustflags = [
+    "-Wprivate_in_public",
     "-Wrust_2018_idioms",
     "-Wsemicolon_in_expressions_from_macros",
     "-Wunused_import_braces",