diff --git a/src/SPC/builder/extension/simdjson.php b/src/SPC/builder/extension/simdjson.php
index 71796ebe..29bf54ba 100644
--- a/src/SPC/builder/extension/simdjson.php
+++ b/src/SPC/builder/extension/simdjson.php
@@ -17,7 +17,7 @@ class simdjson extends Extension
         FileSystem::replaceFileRegex(
             SOURCE_PATH . '/php-src/ext/simdjson/config.m4',
             '/php_version=(`.*`)$/m',
-            'php_version=' . strval($php_ver)
+            'php_version=' . $php_ver
         );
         FileSystem::replaceFileStr(
             SOURCE_PATH . '/php-src/ext/simdjson/config.m4',
@@ -31,4 +31,11 @@ class simdjson extends Extension
         );
         return true;
     }
+
+    public function getSharedExtensionEnv(): array
+    {
+        $env = parent::getSharedExtensionEnv();
+        $env['CFLAGS'] = $env['CXXFLAGS'] = $env['CFLAGS'] . ' -Xclang -target-feature -Xclang +evex512';
+        return $env;
+    }
 }