diff --git a/soh/include/functions.h b/soh/include/functions.h
index 4cbc285a3..360afc687 100644
--- a/soh/include/functions.h
+++ b/soh/include/functions.h
@@ -2404,6 +2404,7 @@ void Heaps_Alloc(void);
 void Heaps_Free(void);
 
 #ifdef __cplusplus
+#undef this
 };
 #endif