diff --git a/build.gradle b/build.gradle
index 8ee1329e..c110f478 100644
--- a/build.gradle
+++ b/build.gradle
@@ -23,6 +23,11 @@ def build_number = 'CUSTOM'
 if (System.getenv('BUILD_NUMBER') != null)
     build_number = System.getenv('BUILD_NUMBER')
 
+def username = 'BloodMagicDev'
+
+if (project.hasProperty('dev_username'))
+    username = "${dev_username}"
+
 group = package_group
 archivesBaseName = mod_name
 version = "${mc_version}-${mod_version}-${build_number}"
@@ -66,7 +71,8 @@ minecraft {
 
     replace "@VERSION@", project.version
     replaceIn "Constants.java"
-    replaceIn "BloodMagicAPI.java"
+
+    clientRunArgs += "--username=${username}"
 
     if (project.hasProperty('mappings_version'))
         mappings = project.mappings_version