diff --git a/qemu/target/i386/translate.c b/qemu/target/i386/translate.c
index 39a01a63..eb179d76 100644
--- a/qemu/target/i386/translate.c
+++ b/qemu/target/i386/translate.c
@@ -4946,6 +4946,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
     bool changed_cc_op = false;
 
     s->pc_start = s->pc = pc_start;
+    s->prefix = 0;
 
     // end address tells us to stop emulation
     if (s->pc == s->uc->addr_end) {