Fix an integral overflow on 64-bit
diff --git a/src/mwindow.c b/src/mwindow.c
index 585d75c..b259218 100644
--- a/src/mwindow.c
+++ b/src/mwindow.c
@@ -35,7 +35,7 @@
: 32 * 1024 * 1024)
#define DEFAULT_MAPPED_LIMIT \
- ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
+ ((1024 * 1024) * (sizeof(void*) >= 8 ? 8192ULL : 256UL))
/*
* We need this because each process is only allowed a specific amount