--- a/src/GameSrc/mouselook.c
+++ b/src/GameSrc/mouselook.c
@@ -121,3 +121,10 @@
         get_mouselook_vel(&mvelx, &mvely);
     }
 }
+
+#ifdef __ANDROID__
+// Whether the player is currently in cyberspace; read by the Android
+// controller input code (android/app/src/main/cpp/xr_input.c) to switch
+// between the normal and cyberspace action sets.
+int qs_in_cyberspace(void) { return global_fullmap != NULL && global_fullmap->cyber; }
+#endif