diff --git a/edm4hep.yaml b/edm4hep.yaml
index ada0f79ca..c303b41b6 100644
--- a/edm4hep.yaml
+++ b/edm4hep.yaml
@@ -571,7 +571,7 @@ datatypes:
       // Reserved bits for the type flagword\n
       static constexpr int BITPrimaryVertex = 1;\n
       static constexpr int BITSecondaryVertex = 2;\n
-      static constexpr int BITTertiaryVertex = 2;\n
+      static constexpr int BITTertiaryVertex = 3;\n
 
       /// Check if this is a primary vertex\n
       bool isPrimary() const { return utils::checkBit(getType(), BITPrimaryVertex); }\n