diff --git a/tcg/alpha/tcg-target.c b/tcg/alpha/tcg-target.c
index dcf23f2..5b7dd25 100644
--- a/tcg/alpha/tcg-target.c
+++ b/tcg/alpha/tcg-target.c
@@ -344,9 +344,9 @@ static inline void tcg_out_addi(TCGContext *s, int reg, long val)
 
 static void tcg_out_andi(TCGContext *s, int ra, long val, int rc)
 {
-    if (val == (uint8_t)val) {
+    if (val == (val & 0xff)) {
         tcg_out_fmt_opi(s, INSN_AND, ra, val, rc);
-    } else if (~val == (uint8_t)~val) {
+    } else if (~val == ~(val & 0xff)) {
         tcg_out_fmt_opi(s, INSN_BIC, ra, ~val, rc);
     } else {
         long mask0, maskff;