diff --git a/src/core/thread/meshcop_tlvs.hpp b/src/core/thread/meshcop_tlvs.hpp
index b2638633e..8d3b8267c 100644
--- a/src/core/thread/meshcop_tlvs.hpp
+++ b/src/core/thread/meshcop_tlvs.hpp
@@ -942,7 +942,7 @@ public:
      * This method initializes the TLV.
      *
      */
-    void Init(void) { SetType(kActiveTimestamp); SetLength(sizeof(*this) - sizeof(Tlv)); }
+    void Init(void) { SetType(kActiveTimestamp); SetLength(sizeof(*this) - sizeof(Tlv)); Timestamp::Init(); }
 
     /**
      * This method indicates whether or not the TLV appears to be well-formed.
@@ -1192,7 +1192,7 @@ public:
      * This method initializes the TLV.
      *
      */
-    void Init(void) { SetType(kPendingTimestamp); SetLength(sizeof(*this) - sizeof(Tlv)); }
+    void Init(void) { SetType(kPendingTimestamp); SetLength(sizeof(*this) - sizeof(Tlv)); Timestamp::Init(); }
 
     /**
      * This method indicates whether or not the TLV appears to be well-formed.
diff --git a/src/core/thread/mle_tlvs.hpp b/src/core/thread/mle_tlvs.hpp
index d5c0e2c46..4db4286d8 100644
--- a/src/core/thread/mle_tlvs.hpp
+++ b/src/core/thread/mle_tlvs.hpp
@@ -1567,7 +1567,11 @@ public:
      * This method initializes the TLV.
      *
      */
-    void Init(void) { SetType(Mle::Tlv::kActiveTimestamp); SetLength(sizeof(*this) - sizeof(Tlv)); }
+    void Init(void) {
+        SetType(Mle::Tlv::kActiveTimestamp);
+        SetLength(sizeof(*this) - sizeof(Tlv));
+        Timestamp::Init();
+    }
 
     /**
      * This method indicates whether or not the TLV appears to be well-formed.
@@ -1591,7 +1595,11 @@ public:
      * This method initializes the TLV.
      *
      */
-    void Init(void) { SetType(Mle::Tlv::kPendingTimestamp); SetLength(sizeof(*this) - sizeof(Tlv)); }
+    void Init(void) {
+        SetType(Mle::Tlv::kPendingTimestamp);
+        SetLength(sizeof(*this) - sizeof(Tlv));
+        Timestamp::Init();
+    }
 
     /**
      * This method indicates whether or not the TLV appears to be well-formed.