diff --git a/py/modgc.c b/py/modgc.c
index a9525a1dcb..d68ff7e6c0 100644
--- a/py/modgc.c
+++ b/py/modgc.c
@@ -32,8 +32,6 @@
 
 /// \module gc - control the garbage collector
 
-extern uint gc_collected;
-
 /// \function collect()
 /// Run a garbage collection.
 STATIC mp_obj_t py_gc_collect(void) {