diff --git a/src/backend_x64/a64_jitstate.h b/src/backend_x64/a64_jitstate.h
index 430de5be..386c3c63 100644
--- a/src/backend_x64/a64_jitstate.h
+++ b/src/backend_x64/a64_jitstate.h
@@ -42,10 +42,10 @@ struct A64JitState {
     alignas(16) std::array<u64, 64> vec{}; // Extension registers.
 
     static constexpr size_t SpillCount = 64;
-    std::array<u64, SpillCount> spill{}; // Spill.
+    alignas(16) std::array<std::array<u64, 2>, SpillCount> spill{}; // Spill.
     static Xbyak::Address GetSpillLocationFromIndex(size_t i) {
         using namespace Xbyak::util;
-        return qword[r15 + offsetof(A64JitState, spill) + i * sizeof(u64)];
+        return xword[r15 + offsetof(A64JitState, spill) + i * sizeof(u64) * 2];
     }
 
     // For internal use (See: BlockOfCode::RunCode)
diff --git a/src/backend_x64/hostloc.h b/src/backend_x64/hostloc.h
index 2d29c87a..bb6d22fd 100644
--- a/src/backend_x64/hostloc.h
+++ b/src/backend_x64/hostloc.h
@@ -53,7 +53,7 @@ inline size_t HostLocBitWidth(HostLoc loc) {
     if (HostLocIsXMM(loc))
         return 128;
     if (HostLocIsSpill(loc))
-        return 64;
+        return 128;
     if (HostLocIsFlag(loc))
         return 1;
     UNREACHABLE();