2 files changed, 3 insertions, 3 deletions
diff --git a/erts/emulator/beam/erl_async.c b/erts/emulator/beam/erl_async.c
index f2a581fdf4..be691317ee 100644
--- a/erts/emulator/beam/erl_async.c
+++ b/erts/emulator/beam/erl_async.c
@@ -390,14 +390,14 @@ int check_async_ready(void)
 **      async_data     data to pass to invoke function
 **      async_free     function for relase async_data in case of failure
 */
-long driver_async(ErlDrvPort ix, unsigned long* key,
+long driver_async(ErlDrvPort ix, unsigned int* key,
 		  void (*async_invoke)(void*), void* async_data,
 		  void (*async_free)(void*))
 {
     ErlAsync* a = (ErlAsync*) erts_alloc(ERTS_ALC_T_ASYNC, sizeof(ErlAsync));
     Port* prt = erts_drvport2port(ix);
     long id;
-    unsigned long qix;
+    unsigned int qix;
 
 
     if (!prt)
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*));