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-rw-r--r--thread_win32.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/thread_win32.h b/thread_win32.h
index 60083da0a1..1a46929ddc 100644
--- a/thread_win32.h
+++ b/thread_win32.h
@@ -32,5 +32,7 @@ typedef struct rb_global_vm_lock_struct {
HANDLE lock;
} rb_global_vm_lock_t;
+void rb_native_mutex_destroy(rb_nativethread_lock_t *lock);
+
#endif /* RUBY_THREAD_WIN32_H */