diff --git a/includes/definitions/discovery/opnsense.yaml b/includes/definitions/discovery/opnsense.yaml
index 6b4460e52d..faf67a4408 100644
--- a/includes/definitions/discovery/opnsense.yaml
+++ b/includes/definitions/discovery/opnsense.yaml
@@ -4,4 +4,4 @@ modules:
             - '/ (?<version>\d+\.\S+)/'
             - '/(?<hardware>\S+)$/'
         version: .1.3.6.1.4.1.8072.1.3.2.3.1.2.7.118.101.114.115.105.111.110
-        version_regex: '/(?<version>[\d.]+) \((?<hardware>[^)]+)\)/'
+        version_regex: '/(?<version>[\d._]+) \((?<hardware>[^)]+)\)/'