diff --git a/modules/backend/composer.json b/modules/backend/composer.json
index 32560e89c..4e4289b34 100644
--- a/modules/backend/composer.json
+++ b/modules/backend/composer.json
@@ -21,8 +21,8 @@
         "october/rain": "~1.0"
     },
     "autoload": {
-        "psr-0": {
-            "Backend": ""
+        "psr-4": {
+            "Backend\\": ""
         }
     },
     "extra": {
diff --git a/modules/cms/composer.json b/modules/cms/composer.json
index 608865aac..df31cf58e 100644
--- a/modules/cms/composer.json
+++ b/modules/cms/composer.json
@@ -21,8 +21,8 @@
         "october/rain": "~1.0"
     },
     "autoload": {
-        "psr-0": {
-            "Cms": ""
+        "psr-4": {
+            "Cms\\": ""
         }
     },
     "extra": {
diff --git a/modules/system/composer.json b/modules/system/composer.json
index 68275400f..1665f8262 100644
--- a/modules/system/composer.json
+++ b/modules/system/composer.json
@@ -21,8 +21,8 @@
         "october/rain": "~1.0"
     },
     "autoload": {
-        "psr-0": {
-            "System": ""
+        "psr-4": {
+            "System\\": ""
         }
     },
     "extra": {