diff --git a/app/Http/Controllers/ImportController.php b/app/Http/Controllers/ImportController.php
index c8aa9c70dbdf..ee953dcf35eb 100644
--- a/app/Http/Controllers/ImportController.php
+++ b/app/Http/Controllers/ImportController.php
@@ -170,20 +170,27 @@ class ImportController extends Controller
         return $data;
     }
 
-    public function detectDelimiter($csvfile)
+    /**
+     * Returns the best delimiter
+     *
+     * @param string $csvfile
+     * @return string
+     */
+    public function detectDelimiter($csvfile): string
     {
         $delimiters = [',', '.', ';'];
         $bestDelimiter = ' ';
         $count = 0;
 
         foreach ($delimiters as $delimiter) {
-            
+
             if (substr_count(strstr($csvfile, "\n", true), $delimiter) >= $count) {
-                $count = substr_count($csvfile, $delimiter);
-                $bestDelimiter = $delimiter;
+                $count = substr_count(strstr($csvfile, "\n", true), $delimiter);
+                $bestDelimiter = $delimiter;        
             }
         
         }
+
         return $bestDelimiter;
     }
 }
diff --git a/app/Http/Requests/Import/PreImportRequest.php b/app/Http/Requests/Import/PreImportRequest.php
index 7f23b64fcfe4..9e959ac882db 100644
--- a/app/Http/Requests/Import/PreImportRequest.php
+++ b/app/Http/Requests/Import/PreImportRequest.php
@@ -28,9 +28,10 @@ class PreImportRequest extends Request
     public function rules()
     {
         return [
-            'files.*' => 'file|mimes:csv,txt',
+            'files.*' => 'file|mimetypes:text/csv,text/plain,application/octet-stream',
             'files' => 'required|array|min:1|max:6',
             'import_type' => 'required',
         ];
     }
+
 }