diff --git a/soh/include/functions.h b/soh/include/functions.h
index 78986cc85..3dcf5f936 100644
--- a/soh/include/functions.h
+++ b/soh/include/functions.h
@@ -2397,6 +2397,8 @@ char* SetQuote();
 void Heaps_Alloc(void);
 void Heaps_Free(void);
 
+CollisionHeader* BgCheck_GetCollisionHeader(CollisionContext* colCtx, s32 bgId);
+
 #ifdef __cplusplus
 #undef this
 };