diff --git a/scrapy/utils/py36.py b/scrapy/utils/py36.py
new file mode 100644
index 000000000..db33a361d
--- /dev/null
+++ b/scrapy/utils/py36.py
@@ -0,0 +1,13 @@
+"""
+collect_asyncgen was put here but later moved to utils.asyncgen.
+"""
+
+import warnings
+
+from scrapy.exceptions import ScrapyDeprecationWarning
+from scrapy.utils.asyncgen import collect_asyncgen  # noqa: F401
+
+
+warnings.warn("Module `scrapy.utils.py36` is deprecated. "
+              "Please import `collect_asyncgen` from `scrapy.utils.asyncgen` instead.",
+              ScrapyDeprecationWarning, stacklevel=2)