diff --git a/siplib/siplib.c b/siplib/siplib.c
index db52b68..8019e97 100644
--- a/siplib/siplib.c
+++ b/siplib/siplib.c
@@ -13747,7 +13747,7 @@ static struct _frame *sip_api_get_frame(int depth)
 
     while (frame != NULL && depth > 0)
     {
-        frame = frame->f_back;
+        frame = PyFrame_GetBack(frame);
         --depth;
     }
 
