diff --git a/src/bank.cpp b/src/bank.cpp
index d5aa183..f93b69d 100644
--- a/src/bank.cpp
+++ b/src/bank.cpp
@@ -4,7 +4,7 @@ using namespace drogon;
 
 bool ValidUsername(const std::string &name) noexcept
 {
-    if (name.size() >= min_name_size || name.size() <= max_name_size)
+    if (name.size() < min_name_size || name.size() > max_name_size)
     {
         return false;
     }