diff --git a/src/lib.rs b/src/lib.rs
index e7ed7e6..f3d9ac4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -26,7 +26,7 @@ pub trait AppConfig: Sized + Serialize + DeserializeOwned + Debug + Default {
     }
 
     /// Get log module levels to use (take priority over the main log level)
-    fn logging_mod_levels(&self) -> Option<HashMap<String, String>> {
+    fn logging_mod_levels(&self) -> Option<&HashMap<String, String>> {
         None
     }
 
@@ -180,8 +180,8 @@ pub trait AppConfig: Sized + Serialize + DeserializeOwned + Debug + Default {
 
         if let Some(mod_levels) = config.logging_mod_levels() {
             for (module, lvl) in mod_levels {
-                let lvl = log::LevelFilter::from_str(lvl.as_ref())?;
-                builder.filter_module(module.as_ref(), lvl);
+                let lvl = log::LevelFilter::from_str(lvl)?;
+                builder.filter_module(module, lvl);
             }
         }