diff --git a/llvm/lib/Target/AArch64/SVEInstrFormats.td b/llvm/lib/Target/AArch64/SVEInstrFormats.td
--- a/llvm/lib/Target/AArch64/SVEInstrFormats.td
+++ b/llvm/lib/Target/AArch64/SVEInstrFormats.td
@@ -5487,7 +5487,7 @@
   def : InstAlias<asm # "\t$Zt, $Pg, [$Zn, $imm5]",
                   (!cast<Instruction>(NAME # _IMM) ZPR64:$Zt, PPR3bAny:$Pg, ZPR64:$Zn, imm_ty:$imm5), 0>;
   def : InstAlias<asm # "\t$Zt, $Pg, [$Zn]",
-                  (!cast<Instruction>(NAME # _IMM) Z_s:$Zt, PPR3bAny:$Pg, ZPR64:$Zn, 0), 1>;
+                  (!cast<Instruction>(NAME # _IMM) Z_d:$Zt, PPR3bAny:$Pg, ZPR64:$Zn, 0), 1>;
 
   def : Pat<(op (nxv2i64 ZPR:$data), (nxv2i1 PPR:$gp), (nxv2i64 ZPR:$ptrs), imm_ty:$index, vt),
             (!cast<Instruction>(NAME # _IMM) ZPR:$data, PPR:$gp, ZPR:$ptrs, imm_ty:$index)>;
diff --git a/llvm/test/MC/AArch64/SVE/st1d.s b/llvm/test/MC/AArch64/SVE/st1d.s
--- a/llvm/test/MC/AArch64/SVE/st1d.s
+++ b/llvm/test/MC/AArch64/SVE/st1d.s
@@ -78,3 +78,9 @@
 // CHECK-ENCODING: [0xff,0xbf,0xdf,0xe5]
 // CHECK-ERROR: instruction requires: sve
 // CHECK-UNKNOWN: ff bf df e5 <unknown>
+
+st1d    { z0.d }, p7, [z0.d, #0]
+// CHECK-INST: st1d    { z0.d }, p7, [z0.d]
+// CHECK-ENCODING: [0x00,0xbc,0xc0,0xe5]
+// CHECK-ERROR: instruction requires: sve
+// CHECK-UNKNOWN: 00 bc c0 e5 <unknown>