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-rw-r--r--erts/emulator/beam/erl_driver.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/erts/emulator/beam/erl_driver.h b/erts/emulator/beam/erl_driver.h
index 15a4f44a7d..9733c0e5b5 100644
--- a/erts/emulator/beam/erl_driver.h
+++ b/erts/emulator/beam/erl_driver.h
@@ -576,7 +576,7 @@ EXTERN int driver_send_term(ErlDrvPort ix, ErlDrvTermData to,
/* Async IO functions */
EXTERN long driver_async(ErlDrvPort ix,
- unsigned long* key,
+ unsigned int* key,
void (*async_invoke)(void*),
void* async_data,
void (*async_free)(void*));