diff --git a/yabause/src/ctrl/src/stv.c b/yabause/src/ctrl/src/stv.c
index 79ca636e14..9a8026ff7c 100644
--- a/yabause/src/ctrl/src/stv.c
+++ b/yabause/src/ctrl/src/stv.c
@@ -64,6 +64,7 @@ const u8 ShienryuNV[0x80]={
     0x00,0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
     0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff};
 
+static int stv_favorite_region = STV_REGION_EU;
 
 static u8 bitswap8(u8 in, const u8* vec)
 {
@@ -82,6 +83,11 @@ void sanjeon_init(void) {
   }
 }
 
+void rsgun_init(void) {
+  if (stv_favorite_region & (STV_REGION_EU | STV_REGION_TW | STV_REGION_US))
+    YuiErrorMsg("Radiant Silvergun is known for having incomplete controls on non-JP bioses");
+}
+
 
 Bios BiosList = 
 {
@@ -1637,7 +1643,7 @@ Game GameList[NB_STV_GAMES]={
     STV_REGION_EU | STV_REGION_US | STV_REGION_JP | STV_REGION_TW,
     0x05272d01,
     0,
-    NULL,
+    rsgun_init,
     NULL,
     {
         GAME_WORD_BLOB, "mpr20958.7",   0x0200000, 0x0200000, 0x00000000,
@@ -2272,7 +2278,6 @@ u8 hasBios = 0;
 u8 hasEeprom = 0;
 u8 fileFound[NB_STV_GAMES][MAX_GAME_FILES];
 u8 biosFound[MAX_GAME_FILES];
-static int stv_favorite_region = STV_REGION_EU;
 
 typedef struct {
     const char* filename;