diff --git a/exec.c b/exec.c
index 4f7a027..5b43172 100644
--- a/exec.c
+++ b/exec.c
@@ -1432,7 +1432,7 @@
        signals are used primarily to interrupt blocking syscalls.  */
 #else
     if (use_icount) {
-        env->icount_decr.u16.high = 0x8000;
+        env->icount_decr.u16.high = 0xffff;
 #ifndef CONFIG_USER_ONLY
         /* CPU_INTERRUPT_EXIT isn't a real interrupt.  It just means
            an async event happened and we need to process it.  */