diff --git a/gallery_dl/extractor/foolfuuka.py b/gallery_dl/extractor/foolfuuka.py
index ef22c5a4..5f90afc1 100644
--- a/gallery_dl/extractor/foolfuuka.py
+++ b/gallery_dl/extractor/foolfuuka.py
@@ -82,7 +82,7 @@ BASE_PATTERN = FoolfuukaExtractor.update({
     },
     "b4k": {
         "root": "https://arch.b4k.dev",
-        "pattern": r"arch\.b4k\.dev",
+        "pattern": r"arch\.b4k\.(?:dev|co)",
     },
     "desuarchive": {
         "root": "https://desuarchive.org",
diff --git a/test/results/b4k.py b/test/results/b4k.py
index 48da702f..fe62e186 100644
--- a/test/results/b4k.py
+++ b/test/results/b4k.py
@@ -12,7 +12,14 @@ __tests__ = (
     "#url"     : "https://arch.b4k.dev/meta/thread/196/",
     "#category": ("foolfuuka", "b4k", "thread"),
     "#class"   : foolfuuka.FoolfuukaThreadExtractor,
-    "#sha1_url": "d309713d2f838797096b3e9cb44fe514a9c9d07a",
+    "#urls"    : "https://arch.b4k.dev/media/meta/image/1481/33/14813348737492.jpg",
+},
+
+{
+    "#url"     : "https://arch.b4k.co/meta/thread/196/",
+    "#category": ("foolfuuka", "b4k", "thread"),
+    "#class"   : foolfuuka.FoolfuukaThreadExtractor,
+    "#urls"    : "https://arch.b4k.dev/media/meta/image/1481/33/14813348737492.jpg",
 },
 
 {