diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -568,7 +568,7 @@
     # The .hg/hgrc file may load extensions or contain config options
     # that influence repository construction. Attempt to load it and
     # process any new extensions that it may have pulled in.
-    if loadhgrc(ui, wdirvfs, hgvfs, requirements):
+    if loadhgrc(ui, wdirvfs, hgvfs, requirements, sharedvfs):
         afterhgrcload(ui, wdirvfs, hgvfs, requirements)
         extensions.loadall(ui)
         extensions.populateui(ui)
@@ -697,7 +697,7 @@
     )
 
 
-def loadhgrc(ui, wdirvfs, hgvfs, requirements):
+def loadhgrc(ui, wdirvfs, hgvfs, requirements, sharedvfs=None):
     """Load hgrc files/content into a ui instance.
 
     This is called during repository opening to load any additional
@@ -708,9 +708,20 @@
     Extensions should monkeypatch this function to modify how per-repo
     configs are loaded. For example, an extension may wish to pull in
     configs from alternate files or sources.
+
+    sharedvfs is vfs object pointing to source repo if the current one is a
+    shared one
     """
     if not rcutil.use_repo_hgrc():
         return False
+
+    # first load config from shared source if we has to
+    if SHARESAFE_REQUIREMENT in requirements and sharedvfs:
+        try:
+            ui.readconfig(sharedvfs.join(b'hgrc'), root=sharedvfs.base)
+        except IOError:
+            pass
+
     try:
         ui.readconfig(hgvfs.join(b'hgrc'), root=wdirvfs.base)
         return True
diff --git a/tests/test-share-safe.t b/tests/test-share-safe.t
--- a/tests/test-share-safe.t
+++ b/tests/test-share-safe.t
@@ -66,4 +66,23 @@
   $ echo c > c
   $ hg ci -Aqm "added c"
 
+Check that config of the source repository is also loaded
+
+  $ hg showconfig ui.curses
+  [1]
+
+  $ echo "[ui]" >> ../source/.hg/hgrc
+  $ echo "curses=true" >> ../source/.hg/hgrc
+
+  $ hg showconfig ui.curses
+  true
+
+However, local .hg/hgrc should override the config set by share source
+
+  $ echo "[ui]" >> .hg/hgrc
+  $ echo "curses=false" >> .hg/hgrc
+
+  $ hg showconfig ui.curses
+  false
+
   $ hg unshare