diff --git a/src/core/utils/mesh_diag.cpp b/src/core/utils/mesh_diag.cpp
index 50b851b10..1e08e855f 100644
--- a/src/core/utils/mesh_diag.cpp
+++ b/src/core/utils/mesh_diag.cpp
@@ -269,7 +269,7 @@ Error MeshDiag::ChildIterator::InitFrom(const Message &aMessage, uint16_t aParen
 {
     Error error;
 
-    SuccessOrExit(error = Tlv::FindTlvValueStartEndOffsets(aMessage, ChildTableTlv::kType, mCurOffset, mCurOffset));
+    SuccessOrExit(error = Tlv::FindTlvValueStartEndOffsets(aMessage, ChildTableTlv::kType, mCurOffset, mEndOffset));
     mMessage      = &aMessage;
     mParentRloc16 = aParentRloc16;