diff --git a/src/supertux/command_line_arguments.cpp b/src/supertux/command_line_arguments.cpp
index aca3e8b1f66..740d7fd1b58 100644
--- a/src/supertux/command_line_arguments.cpp
+++ b/src/supertux/command_line_arguments.cpp
@@ -52,6 +52,7 @@ CommandLineArguments::CommandLineArguments() :
   christmas_mode(),
   repository_url(),
   editor(),
+  from_datadir(),
   resave()
 {
 }