diff --git a/composer.json b/composer.json
index dbbe9b001..95483d7e6 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,8 @@
     "ext-json": "*",
     "ext-zip": "*",
     "ext-mysqli": "*",
-    "ext-dom": "*"
+    "ext-dom": "*",
+    "ext-iconv": "*"
   },
   "config": {
     "platform": {