diff --git a/qemu/target/arm/translate-a64.c b/qemu/target/arm/translate-a64.c
index b9118981..174cf1e1 100644
--- a/qemu/target/arm/translate-a64.c
+++ b/qemu/target/arm/translate-a64.c
@@ -3322,6 +3322,7 @@ static void disas_ldst_multiple_struct(DisasContext *s, uint32_t insn)
     TCGContext *tcg_ctx = s->uc->tcg_ctx;
     int rt = extract32(insn, 0, 5);
     int rn = extract32(insn, 5, 5);
+    int rm = extract32(insn, 16, 5);
     int size = extract32(insn, 10, 2);
     int opcode = extract32(insn, 12, 4);
     bool is_store = !extract32(insn, 22, 1);
@@ -3341,6 +3342,11 @@ static void disas_ldst_multiple_struct(DisasContext *s, uint32_t insn)
         return;
     }
 
+    if (!is_postidx && rm != 0) {
+        unallocated_encoding(s);
+        return;
+    }
+
     /* From the shared decode logic */
     switch (opcode) {
     case 0x0:
@@ -3440,7 +3446,6 @@ static void disas_ldst_multiple_struct(DisasContext *s, uint32_t insn)
     }
 
     if (is_postidx) {
-        int rm = extract32(insn, 16, 5);
         if (rm == 31) {
             tcg_gen_mov_i64(tcg_ctx, tcg_rn, tcg_addr);
         } else {