diff --git a/prerender/seo/feeds.cjs b/prerender/seo/feeds.cjs
index b0ada0e..9f505e4 100644
--- a/prerender/seo/feeds.cjs
+++ b/prerender/seo/feeds.cjs
@@ -337,11 +337,20 @@ const generateProductsXml = (allProductsData = [], baseUrl, config) => {
         return;
       }
 
-      // Skip products without GTIN
+      // Skip products without GTIN or with invalid GTIN
       if (!product.gtin || !product.gtin.toString().trim()) {
         skippedCount++;
         return;
       }
+      
+      // Validate GTIN format (must be numeric and proper length)
+      const gtinString = product.gtin.toString().trim();
+      const isValidGtin = /^\d{8}$|^\d{12}$|^\d{13}$|^\d{14}$/.test(gtinString);
+      
+      if (!isValidGtin) {
+        skippedCount++;
+        return;
+      }
 
       // Skip products without pictures
       if (!product.pictureList || !product.pictureList.trim()) {