diff --git a/src/FpdfServiceProvider.php b/src/FpdfServiceProvider.php
index 432bc43..0ac5daa 100644
--- a/src/FpdfServiceProvider.php
+++ b/src/FpdfServiceProvider.php
@@ -43,7 +43,7 @@ public function register()
      */
     public function registerFpdf()
     {
-        if(config('fpdf.font_path') !== null) {
+        if(config('fpdf.font_path') !== null && !defined('FPDF_FONTPATH')) {
             define('FPDF_FONTPATH', config('fpdf.font_path'));
         }