diff --git a/hyper.h b/hyper.h
index 13edeec5..1554f8e9 100644
--- a/hyper.h
+++ b/hyper.h
@@ -212,7 +212,7 @@ namespace multi {
     int  deadzoneval[MAXJOY][MAXAXE];
     };
 
-  multi::config scfg;  
+  extern config scfg;  
   }
 
 enum eStereo { sOFF, sAnaglyph, sLR, sODS };
@@ -5493,7 +5493,7 @@ namespace dual {
   // 0 = dualmode off, 1 = in dualmode (no game chosen), 2 = in dualmode (working on one of subgames)
   extern int state;
   extern int currently_loaded, main_side;
-  bool affect_both;
+  extern bool affect_both;
 
   bool movepc(int d, int subdir, bool checkonly);
   extern transmatrix player_orientation[2];
diff --git a/multigame.cpp b/multigame.cpp
index f2bcc601..816e4f00 100644
--- a/multigame.cpp
+++ b/multigame.cpp
@@ -77,6 +77,7 @@ namespace dual {
 
   int currently_loaded;
   int main_side;
+  bool affect_both;
 
   gamedata dgd[2];
   transmatrix player_orientation[2];
diff --git a/shmup.cpp b/shmup.cpp
index 992c43e9..2a432c2d 100644
--- a/shmup.cpp
+++ b/shmup.cpp
@@ -24,6 +24,7 @@ namespace shmupballs {
 
 namespace multi {
 
+  config scfg;  
   charstyle scs[MAXPLAYER];
 
   int players = 1;