diff --git a/engine.d b/engine.d
index 85af628..b943e3b 100644
--- a/engine.d
+++ b/engine.d
@@ -261,6 +261,7 @@ class Engine{
 
 					// And handle the data here.
 					switch(clients[a].state){
+					  default: assert(0);
 					  case 0: // this is the timestamp and stuff
 						int ts = SDLNet_Read32(data.ptr);
 						clients[a].numPlayers = SDLNet_Read32(data.ptr+4);
diff --git a/screen.d b/screen.d
index 23b32a5..2bb262c 100644
--- a/screen.d
+++ b/screen.d
@@ -550,12 +550,14 @@ class Screen : Drawable{
 
 	void switchSplitScreenMode(int player, int numberOfPlayers, bool horizontal){
 			switch(numberOfPlayers){
+				default: assert(0);
 				case 1:
 					return;
 //					glViewport(0, 0, xr, yr);
 				break;
 				case 2:
 					switch(player){
+						default: assert(0);
 						case 0:
 							if(horizontal)
 								glViewport(0, yr / 2, xr, yr / 2);
@@ -573,6 +575,7 @@ class Screen : Drawable{
 				case 3:
 				case 4:
 					switch(player){
+						default: assert(0);
 					  case 0:
 						glViewport(0, yr / 2, xr / 2, yr / 2);
 					  break;