diff --git a/debian/changelog b/debian/changelog
index bd9c348..9101fa6 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,12 @@
+ubuntu-dev-tools (0.193ubuntu4) UNRELEASED; urgency=medium
+
+  * Remove references to ftpmaster.internal.  When this name is resolvable
+    but firewalled, syncpackage hangs; and these are tools for developers,
+    not for running in an automated context in the DCs where
+    ftpmaster.internal is reachable.
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Wed, 12 Apr 2023 17:57:35 -0700
+
 ubuntu-dev-tools (0.193ubuntu3) mantic; urgency=medium
 
   * Excise all references to cdbs (including in test cases)
diff --git a/ubuntutools/config.py b/ubuntutools/config.py
index 8125e50..99731ca 100644
--- a/ubuntutools/config.py
+++ b/ubuntutools/config.py
@@ -44,7 +44,6 @@ class UDTConfig:
         "MIRROR_FALLBACK": True,
         "UBUNTU_MIRROR": "http://archive.ubuntu.com/ubuntu",
         "UBUNTU_PORTS_MIRROR": "http://ports.ubuntu.com",
-        "UBUNTU_INTERNAL_MIRROR": "http://ftpmaster.internal/ubuntu",
         "UBUNTU_DDEBS_MIRROR": "http://ddebs.ubuntu.com",
         "UPDATE_BUILDER": False,
         "WORKDIR": None,