diff --git a/dynasm/dasm_arm64.h b/dynasm/dasm_arm64.h
index 0c817f9..9a8a39a 100644
--- a/dynasm/dasm_arm64.h
+++ b/dynasm/dasm_arm64.h
@@ -447,7 +447,7 @@ int dasm_encode(Dst_DECL, void *buffer)
 	  n = DASM_EXTERN(Dst, (unsigned char *)cp, (ins&2047), !(ins&2048));
 	  goto patchrel;
 	case DASM_ALIGN:
-	  ins &= 255; while ((((char *)cp - base) & ins)) *cp++ = 0xe1a00000;
+	  ins &= 255; while ((((char *)cp - base) & ins)) *cp++ = 0xd503201f;
 	  break;
 	case DASM_REL_LG:
 	  if (n < 0) {
diff --git a/dynasm/dasm_arm64.lua b/dynasm/dasm_arm64.lua
index 05954c3..7e9c4cb 100644
--- a/dynasm/dasm_arm64.lua
+++ b/dynasm/dasm_arm64.lua
@@ -248,7 +248,7 @@ local map_cond = {
 
 local parse_reg_type
 
-local function parse_reg(expr, shift, skip_vreg)
+local function parse_reg(expr, shift, no_vreg)
   if not expr then werror("expected register name") end
   local tname, ovreg = match(expr, "^([%w_]+):(@?%l%d+)$")
   if not tname then
@@ -281,7 +281,7 @@ local function parse_reg(expr, shift, skip_vreg)
     elseif parse_reg_type ~= vrt then
       werror("register size mismatch")
     end
-    if not skip_vreg then waction("VREG", shift, vreg) end
+    if not no_vreg then waction("VREG", shift, vreg) end
     return 0
   end
   werror("bad register name `"..expr.."'")
@@ -638,7 +638,7 @@ local function alias_bfx(p)
 end
 
 local function alias_bfiz(p)
-  parse_reg(p[1], 0)
+  parse_reg(p[1], 0, true)
   if parse_reg_type == "w" then
     p[3] = "#(32-("..p[3]:sub(2).."))%32"
     p[4] = "#("..p[4]:sub(2)..")-1"