diff --git a/src/Php/Translator.php b/src/Php/Translator.php
index 791bb4db..47e87121 100644
--- a/src/Php/Translator.php
+++ b/src/Php/Translator.php
@@ -218,12 +218,12 @@ class Translator extends Preprocessor
             $this->error('The `php-config` is not found');
         }
         $phpDir = trim($phpDir);
-        $ext = $this->isMacos() ? '.dylib' : '.so';
-        if (!is_file($phpDir . '/lib/libphp' . $ext)) {
-            $this->error('The `libphp.so` is not found, please run `make` to build it');
+        $ext = $this->isMacos() ? 'dylib' : 'so';
+        if (!is_file($phpDir . '/lib/libphp.' . $ext)) {
+            $this->error("The `libphp.{$ext}` is not found, please run `make` to build it");
         }
-        if (!is_file($this->getPhpxDir() . '/lib/libphpx' . $ext)) {
-            $this->error('The `libphpx.so` is not found, please run `make` to build it');
+        if (!is_file($this->getPhpxDir() . '/lib/libphpx.' . $ext)) {
+            $this->error("The `libphpx.{$ext}` is not found, please run `make` to build it");
         }
 
         $clangFormatVersion = shell_exec('clang-format --version');