diff --git a/dlls/icmp/icmp_main.c b/dlls/icmp/icmp_main.c
index 31bd0c1b02f..8834282d5e4 100644
--- a/dlls/icmp/icmp_main.c
+++ b/dlls/icmp/icmp_main.c
@@ -433,8 +433,9 @@ DWORD WINAPI IcmpSendEcho(
              * Decrease the timeout so that we don't enter an endless loop even
              * if we get flooded with ICMP packets that are not for us.
              */
-            Timeout -= (recv_time - send_time);
-            if (Timeout < 0) Timeout = 0;
+            DWORD t = (recv_time - send_time);
+            if (Timeout > t) Timeout -= t;
+            else             Timeout = 0;
             continue;
         } else {
             /* This is a reply to our packet */