diff --git a/nsnake b/nsnake
index fe9d052..6db3c59 100755
Binary files a/nsnake and b/nsnake differ
diff --git a/obj/main.o b/obj/main.o
index 712eeb3..8be61bb 100644
Binary files a/obj/main.o and b/obj/main.o differ
diff --git a/src/main.c b/src/main.c
index 9b9a623..cb578fd 100644
--- a/src/main.c
+++ b/src/main.c
@@ -58,11 +58,23 @@ int main(void) {
 
         field_print(f);
         switch (c) {
-            case    up_key: dirn = UP;    break;
-            case  down_key: dirn = DOWN;  break;
-            case right_key: dirn = RIGHT; break;
-            case  left_key: dirn = LEFT;  break;
-            case  quit_key: goto quit;
+            case up_key:
+                if (dirn != DOWN)
+                    dirn = UP;
+            break;
+            case down_key:
+                if (dirn != UP)
+                    dirn = DOWN;
+            break;
+            case right_key:
+                if (dirn != LEFT)
+                    dirn = RIGHT;
+            break;
+            case left_key:
+                if (dirn != RIGHT)
+                    dirn = LEFT;
+            break;
+            case quit_key: goto quit;
         }
         snake_forward(s, dirn);
         snake_print(s);