diff --git a/DataFormats/TotemReco/interface/TotemT2Digi.h b/DataFormats/TotemReco/interface/TotemT2Digi.h
index ff1f7bec7f529..2eec5134a7f10 100644
--- a/DataFormats/TotemReco/interface/TotemT2Digi.h
+++ b/DataFormats/TotemReco/interface/TotemT2Digi.h
@@ -9,34 +9,36 @@
 #ifndef DataFormats_TotemReco_TotemT2Digi_h
 #define DataFormats_TotemReco_TotemT2Digi_h
 
-class TotemT2Digi {
-public:
-  TotemT2Digi() = default;
-  TotemT2Digi(unsigned short id, unsigned char marker, unsigned short le, unsigned short te, unsigned char status);
+namespace io_v1 {
+  class TotemT2Digi {
+  public:
+    TotemT2Digi() = default;
+    TotemT2Digi(unsigned short id, unsigned char marker, unsigned short le, unsigned short te, unsigned char status);
 
-  void setLeadingEdge(unsigned short le) { lead_edge_ = le; }
-  unsigned short leadingEdge() const { return lead_edge_; }
-  void setTrailingEdge(unsigned short te) { trail_edge_ = te; }
-  unsigned short trailingEdge() const { return trail_edge_; }
-  unsigned char status() const { return status_ & 0xF; }
-  bool hasLE() const { return marker_ & 0x1; }
-  bool hasTE() const { return marker_ & 0x2; }
-  bool hasManyLE() const { return marker_ & 0x4; }
-  bool hasManyTE() const { return marker_ & 0x8; }
+    void setLeadingEdge(unsigned short le) { lead_edge_ = le; }
+    unsigned short leadingEdge() const { return lead_edge_; }
+    void setTrailingEdge(unsigned short te) { trail_edge_ = te; }
+    unsigned short trailingEdge() const { return trail_edge_; }
+    unsigned char status() const { return status_ & 0xF; }
+    bool hasLE() const { return marker_ & 0x1; }
+    bool hasTE() const { return marker_ & 0x2; }
+    bool hasManyLE() const { return marker_ & 0x4; }
+    bool hasManyTE() const { return marker_ & 0x8; }
 
-private:
-  /// New HW ID in ver 2.2
-  unsigned short id_{0};
-  /// Channel marker
-  unsigned char marker_{0};
-  /// Leading edge time
-  unsigned short lead_edge_{0};
-  /// Trailing edge time
-  unsigned short trail_edge_{0};
-  /// Header status flags
-  unsigned char status_{0};
-};
-
-bool operator<(const TotemT2Digi& lhs, const TotemT2Digi& rhs);
+  private:
+    /// New HW ID in ver 2.2
+    unsigned short id_{0};
+    /// Channel marker
+    unsigned char marker_{0};
+    /// Leading edge time
+    unsigned short lead_edge_{0};
+    /// Trailing edge time
+    unsigned short trail_edge_{0};
+    /// Header status flags
+    unsigned char status_{0};
+  };
 
+  bool operator<(const TotemT2Digi& lhs, const TotemT2Digi& rhs);
+}  // namespace io_v1
+using TotemT2Digi = io_v1::TotemT2Digi;
 #endif
diff --git a/DataFormats/TotemReco/src/TotemT2Digi.cc b/DataFormats/TotemReco/src/TotemT2Digi.cc
index 47ffd2076e42c..4cf1733eb3096 100644
--- a/DataFormats/TotemReco/src/TotemT2Digi.cc
+++ b/DataFormats/TotemReco/src/TotemT2Digi.cc
@@ -1,17 +1,19 @@
 #include "DataFormats/TotemReco/interface/TotemT2Digi.h"
 
-TotemT2Digi::TotemT2Digi(
-    unsigned short id, unsigned char marker, unsigned short le, unsigned short te, unsigned char status)
-    : id_(id), marker_(marker), lead_edge_(le), trail_edge_(te), status_(status) {}
+namespace io_v1 {
+  TotemT2Digi::TotemT2Digi(
+      unsigned short id, unsigned char marker, unsigned short le, unsigned short te, unsigned char status)
+      : id_(id), marker_(marker), lead_edge_(le), trail_edge_(te), status_(status) {}
 
-bool operator<(const TotemT2Digi& lhs, const TotemT2Digi& rhs) {
-  if (lhs.leadingEdge() < rhs.leadingEdge())
-    return true;
-  if (lhs.leadingEdge() > rhs.leadingEdge())
+  bool operator<(const TotemT2Digi& lhs, const TotemT2Digi& rhs) {
+    if (lhs.leadingEdge() < rhs.leadingEdge())
+      return true;
+    if (lhs.leadingEdge() > rhs.leadingEdge())
+      return false;
+    if (lhs.trailingEdge() < rhs.trailingEdge())
+      return true;
+    if (lhs.trailingEdge() > rhs.trailingEdge())
+      return false;
     return false;
-  if (lhs.trailingEdge() < rhs.trailingEdge())
-    return true;
-  if (lhs.trailingEdge() > rhs.trailingEdge())
-    return false;
-  return false;
-}
+  }
+}  // namespace io_v1
diff --git a/DataFormats/TotemReco/src/classes_def.xml b/DataFormats/TotemReco/src/classes_def.xml
index 2f35479c49d5f..58ced04c1c785 100644
--- a/DataFormats/TotemReco/src/classes_def.xml
+++ b/DataFormats/TotemReco/src/classes_def.xml
@@ -1,14 +1,12 @@
 <lcgdict>
-  <class name="TotemT2Digi" ClassVersion="5">
-    <version ClassVersion="5" checksum="1620670855"/>
-    <version ClassVersion="4" checksum="708922079"/>
-    <version ClassVersion="3" checksum="4024006040"/>
+  <class name="io_v1::TotemT2Digi" ClassVersion="3">
+    <version ClassVersion="3" checksum="246842887"/>
   </class>
-  <class name="edmNew::DetSet<TotemT2Digi>"/>
-  <class name="edmNew::DetSetVector<TotemT2Digi>"/>
-  <class name="edm::Wrapper<edmNew::DetSetVector<TotemT2Digi> >"/>
-  <class name="std::vector<TotemT2Digi>"/>
-  <class name="std::vector<edmNew::DetSet<TotemT2Digi> >"/>
+  <class name="edmNew::DetSet<io_v1::TotemT2Digi>"/>
+  <class name="edmNew::DetSetVector<io_v1::TotemT2Digi>"/>
+  <class name="edm::Wrapper<edmNew::DetSetVector<io_v1::TotemT2Digi> >"/>
+  <class name="std::vector<io_v1::TotemT2Digi>"/>
+  <class name="std::vector<edmNew::DetSet<io_v1::TotemT2Digi> >"/>
   <class name="TotemT2RecHit" ClassVersion="3">
     <version ClassVersion="3" checksum="969691996"/>
   </class>