diff --git a/src/paste.rs b/src/paste.rs
index e09f95b..32a3212 100644
--- a/src/paste.rs
+++ b/src/paste.rs
@@ -116,8 +116,9 @@ impl Paste {
         if let Some(max_dir_size) = config.server.max_upload_dir_size {
             let file_size = u64::try_from(self.data.len()).unwrap_or_default();
             let upload_dir = self.type_.get_path(&config.server.upload_path)?;
-            let current_size_of_upload_dir = util::get_dir_size(&upload_dir)
-                .map_err(|_| error::ErrorInternalServerError("Internal server error occured"))?;
+            let current_size_of_upload_dir = util::get_dir_size(&upload_dir).map_err(|e| {
+                error::ErrorInternalServerError(format!("could not get directory size: {e}"))
+            })?;
             let expected_size_of_upload_dir = current_size_of_upload_dir.add(file_size);
             if expected_size_of_upload_dir > max_dir_size {
                 return Err(error::ErrorInsufficientStorage(