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-rw-r--r--Mac/Modules/ibcarbon/_IBCarbon.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Mac/Modules/ibcarbon/_IBCarbon.c b/Mac/Modules/ibcarbon/_IBCarbon.c
index 02c50fe..d2eff02 100644
--- a/Mac/Modules/ibcarbon/_IBCarbon.c
+++ b/Mac/Modules/ibcarbon/_IBCarbon.c
@@ -26,7 +26,7 @@ static PyObject *IBCarbon_Error;
PyTypeObject IBNibRef_Type;
-#define IBNibRefObj_Check(x) ((x)->ob_type == &IBNibRef_Type)
+#define IBNibRefObj_Check(x) ((x)->ob_type == &IBNibRef_Type || PyObject_TypeCheck((x), &IBNibRef_Type))
typedef struct IBNibRefObject {
PyObject_HEAD