Remove sus unsigned long constant
diff --git a/src/mwindow.c b/src/mwindow.c
index 1ef3562..da2dae2 100644
--- a/src/mwindow.c
+++ b/src/mwindow.c
@@ -20,7 +20,7 @@
: 32 * 1024 * 1024)
#define DEFAULT_MAPPED_LIMIT \
- ((1024 * 1024) * (sizeof(void*) >= 8 ? UINT64_C(8192) : 256UL))
+ ((1024 * 1024) * (sizeof(void*) >= 8 ? UINT64_C(8192) : UINT64_C(256)))
/* default is unlimited */
#define DEFAULT_FILE_LIMIT 0