diff --git a/gallery_dl/extractor/pixiv.py b/gallery_dl/extractor/pixiv.py
index 6207bf74..d3e40eef 100644
--- a/gallery_dl/extractor/pixiv.py
+++ b/gallery_dl/extractor/pixiv.py
@@ -111,6 +111,7 @@ class PixivExtractor(Extractor):
                 {
                     "url"   : img["image_urls"]["original"],
                     "suffix": "_p{:02}".format(num),
+                    "_fallback": self._fallback_image(img),
                 }
                 for num, img in enumerate(meta_pages)
             ]
@@ -128,7 +129,7 @@ class PixivExtractor(Extractor):
             self.log.warning("%s: 'My pixiv' locked", work["id"])
 
         elif work["type"] != "ugoira":
-            return ({"url": url},)
+            return ({"url": url, "_fallback": self._fallback_image(url)},)
 
         elif self.load_ugoira:
             try:
@@ -269,6 +270,24 @@ class PixivExtractor(Extractor):
             except exception.HttpError:
                 pass
 
+    def _fallback_image(self, src):
+        if isinstance(src, str):
+            urls = None
+            orig = src
+        else:
+            urls = src["image_urls"]
+            orig = urls["original"]
+
+        base = orig.rpartition(".")[0]
+        yield base.replace("-original/", "-master/", 1) + "_master1200.jpg"
+
+        if urls is None:
+            return
+
+        for fmt in ("large", "medium", "square_medium"):
+            if fmt in urls:
+                yield urls[fmt]
+
     @staticmethod
     def _date_from_url(url, offset=timedelta(hours=9)):
         try:
diff --git a/test/results/pixiv.py b/test/results/pixiv.py
index c4ebc94f..00a8a673 100644
--- a/test/results/pixiv.py
+++ b/test/results/pixiv.py
@@ -289,6 +289,15 @@ __tests__ = (
     "caption": r"re:Either she doesn't know how to pose or she can't move with that much clothing on her, in any case she's very well dressed for a holiday trip around town. Lots of stuff to see and a perfect day to grab some sweet pastries at the bakery.<br />...",
 },
 
+{
+    "#url"     : "https://www.pixiv.net/artworks/56360615",
+    "#comment" : "fallback; 'original' version results in HTTP 500 error (#6762)",
+    "#class"   : pixiv.PixivWorkExtractor,
+    "#options" : {"retries": 0},
+    "#range"   : "4",
+    "#sha1_content": "aa119c27fec0a36bbd06e7491987acf5f1be6293",
+},
+
 {
     "#url"     : "https://www.pixiv.net/en/artworks/966412",
     "#category": ("", "pixiv", "work"),