diff --git a/wrenchboard/src/shared_tool/family_acc.cc b/wrenchboard/src/shared_tool/family_acc.cc
index 6c1de209..ff863855 100644
--- a/wrenchboard/src/shared_tool/family_acc.cc
+++ b/wrenchboard/src/shared_tool/family_acc.cc
@@ -218,7 +218,7 @@ return ret;
 long  WrenchFamilyInitializeAccount(CVars in, CVars &out){
     logfmt(logINFO, "WrenchFamilyInitializeAccount()");
 
-    char username[15] = "";
+    char username[6] = "";
     SetFamilyUsername(in["family_id"].Long(), username, sizeof (username));
 
     int r1;