diff --git a/changes/bug34248 b/changes/bug34248
new file mode 100644
index 0000000000..b89df444ed
--- /dev/null
+++ b/changes/bug34248
@@ -0,0 +1,4 @@
+  o Minor bugfixes (rust, protocol versions):
+    - Declare support for the onion service introduction point denial of
+      service extensions, when building tor with Rust.
+      Fixes bug 34248; bugfix on 0.4.2.1-alpha.
diff --git a/src/rust/protover/protover.rs b/src/rust/protover/protover.rs
index 3a7379d890..076cd5301e 100644
--- a/src/rust/protover/protover.rs
+++ b/src/rust/protover/protover.rs
@@ -163,7 +163,7 @@ pub(crate) fn get_supported_protocols_cstr() -> &'static CStr {
              DirCache=1-2 \
              FlowCtrl=1 \
              HSDir=1-2 \
-             HSIntro=3-4 \
+             HSIntro=3-5 \
              HSRend=1-2 \
              Link=1-5 \
              LinkAuth=3 \
@@ -178,7 +178,7 @@ pub(crate) fn get_supported_protocols_cstr() -> &'static CStr {
              DirCache=1-2 \
              FlowCtrl=1 \
              HSDir=1-2 \
-             HSIntro=3-4 \
+             HSIntro=3-5 \
              HSRend=1-2 \
              Link=1-5 \
              LinkAuth=1,3 \