diff --git a/ChangeLog b/ChangeLog
index 266fa29a..566937ca 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-03-07  Nicolas François  <nicolas.francois@centraliens.net>
+
+	* contrib/adduser-old.c, contrib/adduser.c: Do not use the target
+	of snprintf in one of the format's parameters.
+
 2009-03-07  Nicolas François  <nicolas.francois@centraliens.net>
 
 	* man/groupmems.8.xml: groupmems does not create new user.
diff --git a/contrib/adduser-old.c b/contrib/adduser-old.c
index f924b36e..0b2080ec 100644
--- a/contrib/adduser-old.c
+++ b/contrib/adduser-old.c
@@ -230,7 +230,7 @@ void main()
 			fflush(stdin);
 		} else
 			if (dir[strlen(dir)-1]=='/')
-				sprintf(dir,"%s%s",dir,uname);
+				sprintf(dir+strlen(dir),"%s",uname);
 
 		printf("\nShell [%s]: ",DEFAULT_SHELL);
 		fflush(stdout);
diff --git a/contrib/adduser.c b/contrib/adduser.c
index 72ed94b7..88596b02 100644
--- a/contrib/adduser.c
+++ b/contrib/adduser.c
@@ -296,7 +296,7 @@ main (void)
 	      sprintf (dir, "%s/%s", DEFAULT_HOME, usrname);
 	    }
 	  else if (dir[strlen (dir) - 1] == '/')
-	    sprintf (dir, "%s%s", dir, usrname);
+	    sprintf (dir+strlen(dir), "%s", usrname);
 	}
       else
 	{