diff --git a/src/rt/rust_test_helpers.cpp b/src/rt/rust_test_helpers.cpp
index 64966bd34548..7938d65acd21 100644
--- a/src/rt/rust_test_helpers.cpp
+++ b/src/rt/rust_test_helpers.cpp
@@ -165,3 +165,14 @@ extern "C" CDECL TwoDoubles
 rust_dbg_extern_identity_TwoDoubles(TwoDoubles u) {
     return u;
 }
+
+// Generates increasing port numbers for network testing
+extern "C" CDECL uintptr_t
+rust_dbg_next_port() {
+  static lock_and_signal dbg_port_lock;
+  static uintptr_t next_port = 9000;
+  scoped_lock with(dbg_port_lock);
+  uintptr_t this_port = next_port;
+  next_port += 1;
+  return this_port;
+}
diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index 5a556ed2107d..f84a73a394b6 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -221,4 +221,4 @@ rust_uv_free_ip4_addr
 rust_uv_free_ip6_addr
 rust_call_nullary_fn
 rust_initialize_global_state
-
+rust_dbg_next_port