diff --git a/quickjs.c b/quickjs.c
index 4a88e80..78376ef 100644
--- a/quickjs.c
+++ b/quickjs.c
@@ -1176,8 +1176,8 @@ static int JS_ToUint8ClampFree(JSContext *ctx, int32_t *pres, JSValue val);
 static JSValue js_new_string8_len(JSContext *ctx, const char *buf, int len);
 static JSValue js_compile_regexp(JSContext *ctx, JSValueConst pattern,
                                  JSValueConst flags);
-static JSValue js_regexp_constructor_internal(JSContext *ctx, JSValueConst ctor,
-                                              JSValue pattern, JSValue bc);
+static JSValue js_regexp_set_internal(JSContext *ctx, JSValue obj,
+                                      JSValue pattern, JSValue bc);
 static void gc_decref(JSRuntime *rt);
 static int JS_NewClass1(JSRuntime *rt, JSClassID class_id,
                         const JSClassDef *class_def, JSAtom name);
@@ -5238,7 +5238,7 @@ static JSValue JS_NewObjectFromShape(JSContext *ctx, JSShape *sh, JSClassID clas
     case JS_CLASS_REGEXP:
         p->u.regexp.pattern = NULL;
         p->u.regexp.bytecode = NULL;
-        goto set_exotic;
+        break;
     default:
     set_exotic:
         if (ctx->rt->class_array[class_id].exotic) {
@@ -13426,6 +13426,11 @@ static void js_print_regexp(JSPrintValueState *s, JSObject *p1)
     int i, n, c, c2, bra, flags;
     static const char regexp_flags[] = { 'g', 'i', 'm', 's', 'u', 'y', 'd', 'v' };
 
+    if (!re->pattern || !re->bytecode) {
+        /* the regexp fields are zeroed at init */
+        js_puts(s, "[uninitialized_regexp]");
+        return;
+    }
     p = re->pattern;
     js_putc(s, '/');
     if (p->len == 0) {
@@ -17638,8 +17643,13 @@ static JSValue JS_CallInternal(JSContext *caller_ctx, JSValueConst func_obj,
 
         CASE(OP_regexp):
             {
-                sp[-2] = js_regexp_constructor_internal(ctx, JS_UNDEFINED,
-                                                        sp[-2], sp[-1]);
+                JSValue obj;
+                obj = JS_NewObjectClass(ctx, JS_CLASS_REGEXP);
+                if (JS_IsException(obj))
+                    goto exception;
+                sp[-2] = js_regexp_set_internal(ctx, obj, sp[-2], sp[-1]);
+                if (JS_IsException(sp[-2]))
+                    goto exception;
                 sp--;
             }
             BREAK;
@@ -46105,8 +46115,10 @@ static void js_regexp_finalizer(JSRuntime *rt, JSValue val)
 {
     JSObject *p = JS_VALUE_GET_OBJ(val);
     JSRegExp *re = &p->u.regexp;
-    JS_FreeValueRT(rt, JS_MKPTR(JS_TAG_STRING, re->bytecode));
-    JS_FreeValueRT(rt, JS_MKPTR(JS_TAG_STRING, re->pattern));
+    if (re->bytecode != NULL)
+        JS_FreeValueRT(rt, JS_MKPTR(JS_TAG_STRING, re->bytecode));
+    if (re->pattern != NULL)
+        JS_FreeValueRT(rt, JS_MKPTR(JS_TAG_STRING, re->pattern));
 }
 
 /* create a string containing the RegExp bytecode */
@@ -46188,32 +46200,29 @@ static JSValue js_compile_regexp(JSContext *ctx, JSValueConst pattern,
     return ret;
 }
 
-/* create a RegExp object from a string containing the RegExp bytecode
-   and the source pattern */
-static JSValue js_regexp_constructor_internal(JSContext *ctx, JSValueConst ctor,
-                                              JSValue pattern, JSValue bc)
+/* set the RegExp fields */
+static JSValue js_regexp_set_internal(JSContext *ctx,
+                                      JSValue obj,
+                                      JSValue pattern, JSValue bc)
 {
-    JSValue obj;
     JSObject *p;
     JSRegExp *re;
 
     /* sanity check */
-    if (JS_VALUE_GET_TAG(bc) != JS_TAG_STRING ||
-        JS_VALUE_GET_TAG(pattern) != JS_TAG_STRING) {
+    if (unlikely(JS_VALUE_GET_TAG(bc) != JS_TAG_STRING ||
+                 JS_VALUE_GET_TAG(pattern) != JS_TAG_STRING)) {
         JS_ThrowTypeError(ctx, "string expected");
-    fail:
+        JS_FreeValue(ctx, obj);
         JS_FreeValue(ctx, bc);
         JS_FreeValue(ctx, pattern);
         return JS_EXCEPTION;
     }
 
-    obj = js_create_from_ctor(ctx, ctor, JS_CLASS_REGEXP);
-    if (JS_IsException(obj))
-        goto fail;
     p = JS_VALUE_GET_OBJ(obj);
     re = &p->u.regexp;
     re->pattern = JS_VALUE_GET_STRING(pattern);
     re->bytecode = JS_VALUE_GET_STRING(bc);
+    /* Note: cannot fail because the field is preallocated */
     JS_DefinePropertyValue(ctx, obj, JS_ATOM_lastIndex, JS_NewInt32(ctx, 0),
                            JS_PROP_WRITABLE);
     return obj;
@@ -46250,7 +46259,7 @@ static int js_is_regexp(JSContext *ctx, JSValueConst obj)
 static JSValue js_regexp_constructor(JSContext *ctx, JSValueConst new_target,
                                      int argc, JSValueConst *argv)
 {
-    JSValue pattern, flags, bc, val;
+    JSValue pattern, flags, bc, val, obj = JS_UNDEFINED;
     JSValueConst pat, flags1;
     JSRegExp *re;
     int pat_is_regexp;
@@ -46280,11 +46289,12 @@ static JSValue js_regexp_constructor(JSContext *ctx, JSValueConst new_target,
         pattern = JS_DupValue(ctx, JS_MKPTR(JS_TAG_STRING, re->pattern));
         if (JS_IsUndefined(flags1)) {
             bc = JS_DupValue(ctx, JS_MKPTR(JS_TAG_STRING, re->bytecode));
+            obj = js_create_from_ctor(ctx, new_target, JS_CLASS_REGEXP);
+            if (JS_IsException(obj))
+                goto fail;
             goto no_compilation;
         } else {
-            flags = JS_ToString(ctx, flags1);
-            if (JS_IsException(flags))
-                goto fail;
+            flags = JS_DupValue(ctx, flags1);
         }
     } else {
         flags = JS_UNDEFINED;
@@ -46313,15 +46323,19 @@ static JSValue js_regexp_constructor(JSContext *ctx, JSValueConst new_target,
                 goto fail;
         }
     }
+    obj = js_create_from_ctor(ctx, new_target, JS_CLASS_REGEXP);
+    if (JS_IsException(obj))
+        goto fail;
     bc = js_compile_regexp(ctx, pattern, flags);
     if (JS_IsException(bc))
         goto fail;
     JS_FreeValue(ctx, flags);
  no_compilation:
-    return js_regexp_constructor_internal(ctx, new_target, pattern, bc);
+    return js_regexp_set_internal(ctx, obj, pattern, bc);
  fail:
     JS_FreeValue(ctx, pattern);
     JS_FreeValue(ctx, flags);
+    JS_FreeValue(ctx, obj);
     return JS_EXCEPTION;
 }
 
diff --git a/test262_errors.txt b/test262_errors.txt
index 7cd4963..f97c940 100644
--- a/test262_errors.txt
+++ b/test262_errors.txt
@@ -14,8 +14,6 @@ test262/test/staging/sm/Function/function-name-for.js:13: Test262Error: Expected
 test262/test/staging/sm/Function/implicit-this-in-parameter-expression.js:12: Test262Error: Expected SameValue(«[object Object]», «undefined») to be true
 test262/test/staging/sm/Function/invalid-parameter-list.js:13: Test262Error: Expected a SyntaxError to be thrown but no exception was thrown at all
 test262/test/staging/sm/Function/invalid-parameter-list.js:13: strict mode: Test262Error: Expected a SyntaxError to be thrown but no exception was thrown at all
-test262/test/staging/sm/RegExp/constructor-ordering-2.js:12: Test262Error: Expected SameValue(«false», «true») to be true
-test262/test/staging/sm/RegExp/constructor-ordering-2.js:12: strict mode: Test262Error: Expected SameValue(«false», «true») to be true
 test262/test/staging/sm/RegExp/regress-613820-1.js:12: Test262Error: Actual [aaa, aa, a] and expected [aa, a, a] should have the same contents. 
 test262/test/staging/sm/RegExp/regress-613820-1.js:12: strict mode: Test262Error: Actual [aaa, aa, a] and expected [aa, a, a] should have the same contents. 
 test262/test/staging/sm/RegExp/regress-613820-2.js:12: Test262Error: Actual [foobar, f, o, o, b, a, r] and expected [foobar, undefined, undefined, undefined, b, a, r] should have the same contents.