diff --git a/Include/floatobject.h b/Include/floatobject.h
index f18933b..459b029 100644
--- a/Include/floatobject.h
+++ b/Include/floatobject.h
@@ -91,6 +91,9 @@
 PyAPI_FUNC(double) _PyFloat_Unpack4(const unsigned char *p, int le);
 PyAPI_FUNC(double) _PyFloat_Unpack8(const unsigned char *p, int le);
 
+/* free list api */
+PyAPI_FUNC(void) PyFloat_CompactFreeList(size_t *, size_t *, size_t *);
+
 #ifdef __cplusplus
 }
 #endif