diff --git a/osism/utils/rabbitmq.py b/osism/utils/rabbitmq.py
index ad5b1dcf3..e11f1f21b 100644
--- a/osism/utils/rabbitmq.py
+++ b/osism/utils/rabbitmq.py
@@ -92,11 +92,11 @@ def get_rabbitmq_node_addresses():
 
                 logger.debug(f"Internal interface for {host}: {internal_interface}")
 
-                # Look for the interface in ansible facts
-                # Interface names with special chars are normalized (e.g., eth0.100 -> ansible_eth0_100)
-                normalized_interface = internal_interface.replace(".", "_").replace(
-                    "-", "_"
-                )
+                # Look for the interface in ansible facts. Ansible replaces "-"
+                # with "_" in fact names and leaves dots alone
+                # (PrefixFactNamespace._underscore), so "br-ex" is
+                # ansible_br_ex while "bond0.100" is ansible_bond0.100.
+                normalized_interface = internal_interface.replace("-", "_")
                 interface_key = f"ansible_{normalized_interface}"
 
                 interface_facts = facts.get(interface_key)
diff --git a/tests/unit/utils/test_rabbitmq.py b/tests/unit/utils/test_rabbitmq.py
index 874351fce..d061b2974 100644
--- a/tests/unit/utils/test_rabbitmq.py
+++ b/tests/unit/utils/test_rabbitmq.py
@@ -346,17 +346,18 @@ def test_template_traversal_hits_non_dict_skips_host(
         _assert_error_logged(loguru_logs, "Could not resolve template")
 
     @pytest.mark.parametrize(
-        "interface,normalized_key",
-        [("eth0.100", "ansible_eth0_100"), ("eth-0", "ansible_eth_0")],
+        "interface,fact_key",
+        [("eth0.100", "ansible_eth0.100"), ("eth-0", "ansible_eth_0")],
     )
-    def test_interface_name_normalized_for_fact_lookup(
-        self, setup_addresses, loguru_logs, interface, normalized_key
+    def test_interface_name_mapped_to_fact_key(
+        self, setup_addresses, loguru_logs, interface, fact_key
     ):
-        # Facts are only stored under the normalized key, so a correct lookup
-        # is the only way the address can be found.
+        # Facts are only stored under the key Ansible actually uses, so a
+        # correct mapping is the only way the address can be found. Ansible
+        # replaces "-" with "_" and keeps dots.
         setup_addresses(
             hosts=["host1"],
-            redis_side_effect=[_facts(normalized_key, "10.0.0.7")],
+            redis_side_effect=[_facts(fact_key, "10.0.0.7")],
             check_output=[_GROUP_LISTING, _hostvars(interface)],
         )