diff --git a/exec.c b/exec.c
index 14767b7..26cd8b9 100644
--- a/exec.c
+++ b/exec.c
@@ -2410,7 +2410,7 @@ int page_check_range(target_ulong start, target_ulong len, int flags)
     assert(start < ((abi_ulong)1 << L1_MAP_ADDR_SPACE_BITS));
 #endif
 
-    if (start + len - 1 < start) {
+    if (len > 0 && start + len -1 < start) {
         /* We've wrapped around.  */
         return -1;
     }