diff --git a/src/pkg/runtime/mem_windows.c b/src/pkg/runtime/mem_windows.c
index 551c96ce99..7f55677c29 100644
--- a/src/pkg/runtime/mem_windows.c
+++ b/src/pkg/runtime/mem_windows.c
@@ -71,7 +71,7 @@ runtime·SysFault(void *v, uintptr n)
 }
 
 void*
-runtime·SysReserve(void *v, uintptr n)
+runtime·SysReserve(void *v, uintptr n, bool *reserved)
 {
 	*reserved = true;
 	// v is just a hint.