diff --git a/opm/parser/eclipse/Deck/DeckRecord.cpp b/opm/parser/eclipse/Deck/DeckRecord.cpp
index 0d0e7f92f..d2b53834b 100644
--- a/opm/parser/eclipse/Deck/DeckRecord.cpp
+++ b/opm/parser/eclipse/Deck/DeckRecord.cpp
@@ -18,6 +18,7 @@
  */
 
 
+#include <unordered_set>
 #include <stdexcept>
 #include <string>
 #include <algorithm>
@@ -29,8 +30,26 @@
 namespace Opm {
 
 
-    DeckRecord::DeckRecord( size_t sz ) {
-        this->m_items.reserve( sz );
+    DeckRecord::DeckRecord( std::vector< DeckItem >&& items ) :
+        m_items( std::move( items ) ) {
+
+        std::unordered_set< std::string > names;
+        for( const auto& item : this->m_items )
+            names.insert( item.name() );
+
+        if( names.size() == this->m_items.size() )
+            return;
+
+        names.clear();
+        std::string msg = "Duplicate item names in DeckRecord:";
+        for( const auto& item : this->m_items ) {
+            if( names.count( item.name() ) != 0 )
+                msg += std::string( " " ) += item.name();
+
+            names.insert( item.name() );
+        }
+
+        throw std::invalid_argument( msg );
     }
 
     size_t DeckRecord::size() const {
diff --git a/opm/parser/eclipse/Deck/DeckRecord.hpp b/opm/parser/eclipse/Deck/DeckRecord.hpp
index 47e180e38..752f91c3a 100644
--- a/opm/parser/eclipse/Deck/DeckRecord.hpp
+++ b/opm/parser/eclipse/Deck/DeckRecord.hpp
@@ -33,7 +33,7 @@ namespace Opm {
         typedef std::vector< DeckItem >::const_iterator const_iterator;
 
         DeckRecord() = default;
-        DeckRecord( size_t );
+        DeckRecord( std::vector< DeckItem >&& );
 
         size_t size() const;
         void addItem( DeckItem&& deckItem );
diff --git a/opm/parser/eclipse/Deck/tests/DeckRecordTests.cpp b/opm/parser/eclipse/Deck/tests/DeckRecordTests.cpp
index 26df6c183..e66056142 100644
--- a/opm/parser/eclipse/Deck/tests/DeckRecordTests.cpp
+++ b/opm/parser/eclipse/Deck/tests/DeckRecordTests.cpp
@@ -71,6 +71,8 @@ BOOST_AUTO_TEST_CASE(addItem_differentItemsSameName_throws) {
     DeckRecord deckRecord;
     deckRecord.addItem( mkIntItem( "TEST" ) );
     BOOST_CHECK_THROW( deckRecord.addItem( mkIntItem( "TEST" ) ), std::invalid_argument );
+    std::vector< DeckItem > items = { mkIntItem( "TEST" ), mkIntItem( "TEST" ) };
+    BOOST_CHECK_THROW( DeckRecord( std::move( items ) ), std::invalid_argument );
 }
 
 BOOST_AUTO_TEST_CASE(get_byIndex_returnsItem) {
diff --git a/opm/parser/eclipse/Parser/ParserRecord.cpp b/opm/parser/eclipse/Parser/ParserRecord.cpp
index 5056ac6c4..1ae319a06 100644
--- a/opm/parser/eclipse/Parser/ParserRecord.cpp
+++ b/opm/parser/eclipse/Parser/ParserRecord.cpp
@@ -118,11 +118,10 @@ namespace Opm {
     }
 
     DeckRecord ParserRecord::parse(const ParseContext& parseContext , MessageContainer& msgContainer, RawRecord& rawRecord ) const {
-        DeckRecord deckRecord( size() + 20 );
-        for (size_t i = 0; i < size(); i++) {
-            auto parserItem = get(i);
-            deckRecord.addItem( parserItem->scan( rawRecord ) );
-        }
+        std::vector< DeckItem > items;
+        items.reserve( this->size() + 20 );
+        for( const auto& parserItem : *this )
+            items.emplace_back( parserItem->scan( rawRecord ) );
 
         if (rawRecord.size() > 0) {
             std::string msg = "The RawRecord for keyword \""  + rawRecord.getKeywordName() + "\" in file\"" + rawRecord.getFileName() + "\" contained " +
@@ -131,7 +130,7 @@ namespace Opm {
             parseContext.handleError(ParseContext::PARSE_EXTRA_DATA , msgContainer, msg);
         }
 
-        return deckRecord;
+        return { std::move( items ) };
     }
 
     bool ParserRecord::equal(const ParserRecord& other) const {