diff --git a/static/js/select_month.js b/static/js/select_month.js
index 8a7f958..9c54b2e 100644
--- a/static/js/select_month.js
+++ b/static/js/select_month.js
@@ -5,9 +5,9 @@ document.addEventListener("DOMContentLoaded", () => {
         const month = select.value;
         const url = new URL(window.location.href);
         if (month) {
-            url.searchParams.set("month", month);
+            url.searchParams.set("m", month);
         } else {
-            url.searchParams.delete("month");
+            url.searchParams.delete("m");
         }
         window.location.href = url.toString();
     });
diff --git a/templates/main.html b/templates/main.html
index c7d3f49..29f047c 100644
--- a/templates/main.html
+++ b/templates/main.html
@@ -38,8 +38,7 @@
 <div class="d-none d-md-flex justify-content-end align-items-center flex-wrap gap-2 mb-3">
   <label for="monthSelect" class="text-white small mb-0">📅 Wybierz miesiąc:</label>
   <select id="monthSelect" class="form-select form-select-sm bg-dark text-white border-secondary"
-          style="min-width: 180px;"
-          onchange="window.location.search='?m='+this.value">
+          style="min-width: 180px;">
     {% for m in month_options %}
       {% set year, month = m.split('-') %}
       <option value="{{ m }}" {% if selected_month == m %}selected{% endif %}>
@@ -59,7 +58,6 @@
   </button>
 </div>
 
-
 {% if current_user.is_authenticated %}
 <h3 class="mt-4 d-flex justify-content-between align-items-center flex-wrap">
   Twoje listy