Index: ps/trunk/source/ps/GameSetup/GameSetup.h
===================================================================
--- ps/trunk/source/ps/GameSetup/GameSetup.h
+++ ps/trunk/source/ps/GameSetup/GameSetup.h
@@ -78,7 +78,7 @@
 
 class CmdLineArgs;
 class Paths;
-extern std::vector<CStr>& GetMods(const CmdLineArgs& args, int flags);
+extern const std::vector<CStr>& GetMods(const CmdLineArgs& args, int flags);
 extern void MountMods(const Paths& paths, const std::vector<CStr>& mods);
 /**
  * Returns true if successful, false if mods changed and restart_engine was called.
Index: ps/trunk/source/ps/GameSetup/GameSetup.cpp
===================================================================
--- ps/trunk/source/ps/GameSetup/GameSetup.cpp
+++ ps/trunk/source/ps/GameSetup/GameSetup.cpp
@@ -408,7 +408,7 @@
 	return ERI_NOT_IMPLEMENTED;
 }
 
-std::vector<CStr>& GetMods(const CmdLineArgs& args, int flags)
+const std::vector<CStr>& GetMods(const CmdLineArgs& args, int flags)
 {
 	const bool init_mods = (flags & INIT_MODS) == INIT_MODS;
 	const bool add_user = !InDevelopmentCopy() && !args.Has("noUserMod");