diff --git a/include/mgba/gba/interface.h b/include/mgba/gba/interface.h
index 612afc383..aedd8895d 100644
--- a/include/mgba/gba/interface.h
+++ b/include/mgba/gba/interface.h
@@ -78,6 +78,8 @@ struct GBASIODriver {
 	uint16_t (*writeRegister)(struct GBASIODriver* driver, uint32_t address, uint16_t value);
 };
 
+void GBASIOJOYCreate(struct GBASIODriver* sio);
+
 enum GBASIOBattleChipGateFlavor {
 	GBA_FLAVOR_BATTLECHIP_GATE = 4,
 	GBA_FLAVOR_PROGRESS_GATE = 5,
diff --git a/include/mgba/internal/gba/sio.h b/include/mgba/internal/gba/sio.h
index e5656da0c..2c06af698 100644
--- a/include/mgba/internal/gba/sio.h
+++ b/include/mgba/internal/gba/sio.h
@@ -82,7 +82,6 @@ void GBASIOWriteRCNT(struct GBASIO* sio, uint16_t value);
 void GBASIOWriteSIOCNT(struct GBASIO* sio, uint16_t value);
 uint16_t GBASIOWriteRegister(struct GBASIO* sio, uint32_t address, uint16_t value);
 
-void GBASIOJOYCreate(struct GBASIODriver* sio);
 int GBASIOJOYSendCommand(struct GBASIODriver* sio, enum GBASIOJOYCommand command, uint8_t* data);
 
 CXX_GUARD_END