diff --git a/src/server.rs b/src/server.rs
index 089fa03..e92249f 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -159,8 +159,8 @@ impl FromRequest for CustomRequest {
                     let mut field = el?;
 
                     let content_type = field.content_disposition().clone();
-                    let name = content_type.get_name().ok_or(
-                        ErrorInternalServerError("Missing field name!"))?;
+                    let name = content_type.get_name().
+                        ok_or_else(|| ErrorInternalServerError("Missing field name!"))?;
 
                     // Handle file upload
                     if content_type.get_filename().is_some() {