diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c
index 8d43a8d272..d6d10c980e 100644
--- a/hw/core/qdev-properties.c
+++ b/hw/core/qdev-properties.c
@@ -1177,7 +1177,7 @@ static int print_size(DeviceState *dev, Property *prop, char *dest, size_t len)
     int i = 0;
     uint64_t div;
 
-    for (div = (long int)1 << 40; !(*ptr / div) ; div >>= 10) {
+    for (div = 1ULL << 40; !(*ptr / div) ; div >>= 10) {
         i++;
     }
     return snprintf(dest, len, "%0.03f%c", (double)*ptr/div, suffixes[i]);