diff --git a/src/os_win32.c b/src/os_win32.c
index fb1b29d..55df506 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -5280,7 +5280,7 @@
     ofd[1] = INVALID_HANDLE_VALUE;
     efd[0] = INVALID_HANDLE_VALUE;
     efd[1] = INVALID_HANDLE_VALUE;
-    ga_init2(&ga, (int)sizeof(wchar_t), 500);
+    ga_init2(&ga, sizeof(wchar_t), 500);
 
     jo = CreateJobObject(NULL, NULL);
     if (jo == NULL)