diff --git a/core/sync/futex_darwin.odin b/core/sync/futex_darwin.odin
index 88e354827..a106faa9c 100644
--- a/core/sync/futex_darwin.odin
+++ b/core/sync/futex_darwin.odin
@@ -8,7 +8,7 @@ import "core:time"
 foreign import System "System.framework"
 
 foreign System {
-	__ulock_wait  :: proc "c" (operation: u32, addr: rawptr, value: u64, timeout_ms: u32) -> c.int ---
+	__ulock_wait  :: proc "c" (operation: u32, addr: rawptr, value: u64, timeout_us: u32) -> c.int ---
 	__ulock_wait2 :: proc "c" (operation: u32, addr: rawptr, value: u64, timeout_ns: u64, value2: u64) -> c.int ---
 	__ulock_wake  :: proc "c" (operation: u32, addr: rawptr, wake_value: u64) -> c.int ---
 }