diff --git a/tcg/i386/tcg-target.c.inc b/tcg/i386/tcg-target.c.inc
index d8fd38d9e7..5d7fe5b300 100644
--- a/tcg/i386/tcg-target.c.inc
+++ b/tcg/i386/tcg-target.c.inc
@@ -1315,7 +1315,9 @@ static void tcg_out_exts_i32_i64(TCGContext *s, TCGReg dest, TCGReg src)
 
 static void tcg_out_extu_i32_i64(TCGContext *s, TCGReg dest, TCGReg src)
 {
-    tcg_out_ext32u(s, dest, src);
+    if (dest != src) {
+        tcg_out_ext32u(s, dest, src);
+    }
 }
 
 static void tcg_out_extrl_i64_i32(TCGContext *s, TCGReg dest, TCGReg src)