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-rw-r--r--py/mpstate.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/py/mpstate.h b/py/mpstate.h
index ab7d8c51b..9bb87f0ba 100644
--- a/py/mpstate.h
+++ b/py/mpstate.h
@@ -98,7 +98,7 @@ typedef struct _mp_state_mem_t {
size_t gc_collected;
#endif
- #if MICROPY_PY_THREAD
+ #if MICROPY_PY_THREAD && !MICROPY_PY_THREAD_GIL
// This is a global mutex used to make the GC thread-safe.
mp_thread_mutex_t gc_mutex;
#endif