diff --git a/src/lj_err.c b/src/lj_err.c
index 414ef477..b0ceaa2f 100644
--- a/src/lj_err.c
+++ b/src/lj_err.c
@@ -239,12 +239,6 @@ typedef struct UndocumentedDispatcherContext {
 /* Another wild guess. */
 extern void __DestructExceptionObject(EXCEPTION_RECORD *rec, int nothrow);
 
-#if LJ_TARGET_X64 && defined(MINGW_SDK_INIT)
-/* Workaround for broken MinGW64 declaration. */
-VOID RtlUnwindEx_FIXED(PVOID,PVOID,PVOID,PVOID,PVOID,PVOID) asm("RtlUnwindEx");
-#define RtlUnwindEx RtlUnwindEx_FIXED
-#endif
-
 #define LJ_MSVC_EXCODE		((DWORD)0xe06d7363)
 #define LJ_GCC_EXCODE		((DWORD)0x20474343)
 
diff --git a/src/lj_record.c b/src/lj_record.c
index 3ba2ce8b..fedd47a6 100644
--- a/src/lj_record.c
+++ b/src/lj_record.c
@@ -1074,6 +1074,7 @@ int lj_record_mm_lookup(jit_State *J, RecordIndex *ix, MMS mm)
   } else if (tref_isudata(ix->tab)) {
     int udtype = udataV(&ix->tabv)->udtype;
     mt = tabref(udataV(&ix->tabv)->metatable);
+    mix.tab = emitir(IRT(IR_FLOAD, IRT_TAB), ix->tab, IRFL_UDATA_META);
     /* The metatables of special userdata objects are treated as immutable. */
     if (udtype != UDTYPE_USERDATA) {
       cTValue *mo;
@@ -1087,6 +1088,8 @@ int lj_record_mm_lookup(jit_State *J, RecordIndex *ix, MMS mm)
       }
   immutable_mt:
       mo = lj_tab_getstr(mt, mmname_str(J2G(J), mm));
+      ix->mt = mix.tab;
+      ix->mtv = mt;
       if (!mo || tvisnil(mo))
 	return 0;  /* No metamethod. */
       /* Treat metamethod or index table as immutable, too. */
@@ -1094,11 +1097,8 @@ int lj_record_mm_lookup(jit_State *J, RecordIndex *ix, MMS mm)
 	lj_trace_err(J, LJ_TRERR_BADTYPE);
       copyTV(J->L, &ix->mobjv, mo);
       ix->mobj = lj_ir_kgc(J, gcV(mo), tvisfunc(mo) ? IRT_FUNC : IRT_TAB);
-      ix->mtv = mt;
-      ix->mt = TREF_NIL;  /* Dummy value for comparison semantics. */
       return 1;  /* Got metamethod or index table. */
     }
-    mix.tab = emitir(IRT(IR_FLOAD, IRT_TAB), ix->tab, IRFL_UDATA_META);
   } else {
     /* Specialize to base metatable. Must flush mcode in lua_setmetatable(). */
     mt = tabref(basemt_obj(J2G(J), &ix->tabv));