diff --git a/tcg/ppc/tcg-target.c.inc b/tcg/ppc/tcg-target.c.inc
index 4750091c9c..de4483e43b 100644
--- a/tcg/ppc/tcg-target.c.inc
+++ b/tcg/ppc/tcg-target.c.inc
@@ -1832,11 +1832,14 @@ static void tcg_out_brcond2 (TCGContext *s, const TCGArg *args,
 
 static void tcg_out_mb(TCGContext *s, TCGArg a0)
 {
-    uint32_t insn = HWSYNC;
-    a0 &= TCG_MO_ALL;
-    if (a0 == TCG_MO_LD_LD) {
+    uint32_t insn;
+
+    if (a0 & TCG_MO_ST_LD) {
+        insn = HWSYNC;
+    } else {
         insn = LWSYNC;
     }
+
     tcg_out32(s, insn);
 }