diff --git a/tccgen.c b/tccgen.c
index d456a2a..510051a 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -4883,6 +4883,7 @@ static void block(int *bsym, int *csym, int *case_sym, int *def_sym,
         b = gjmp(0);
         gsym(*case_sym);
         vseti(case_reg, 0);
+        vdup();
         vpushi(v1);
         if (v1 == v2) {
             gen_op(TOK_EQ);
@@ -4895,6 +4896,8 @@ static void block(int *bsym, int *csym, int *case_sym, int *def_sym,
             gen_op(TOK_LE);
             *case_sym = gtst(1, *case_sym);
         }
+        case_reg = gv(RC_INT);
+        vpop();
         gsym(b);
         skip(':');
         is_expr = 0;