diff --git a/composer.json b/composer.json
index d78a28b8b606973f232295588dba881bf7940853..e8833442f0d1c9a2e6826e3e1dc5318ecb125227 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,7 @@
     }
   ],
   "autoload": {
-    "classmap": ["./classes"]
+    "classmap": ["./classes", "./interfaces"]
   },
   "config": {
     "classmap-authoritative": true