<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!--
  This file is part of the Dutch Taxonomy (Nederlandse Taxonomie; NT)
  Intellectual Property of the State of the Netherlands
  Architecture: NT13
  Version: 20181212.a
  Release date: Tue Jun 19 09:00:00 2018
-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink">
  <link:roleRef roleURI="urn:kvk:linkrole:notes-indirect-measurement-fair-value-goods-services-breakdown-ifrs-full" xlink:href="../dictionary/kvk-linkroles-ifrs-full.xsd#kvk-ifrs-lr_NotesIndirectMeasurementFairValueGoodsServicesBreakdownIFRSFull" xlink:type="simple"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple"/>
  <link:definitionLink xlink:role="urn:kvk:linkrole:notes-indirect-measurement-fair-value-goods-services-breakdown-ifrs-full" xlink:type="extended">
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted_loc" xlink:type="arc"/>
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_DescriptionOfOptionLifeShareOptionsGranted_loc" xlink:type="arc"/>
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted_loc" xlink:type="arc"/>
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_ExercisePriceShareOptionsGranted_loc" xlink:type="arc"/>
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted_loc" xlink:type="arc"/>
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_ExpectedDividendShareOptionsGranted_loc" xlink:type="arc"/>
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_ExpenseFromCashsettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets_loc" xlink:type="arc"/>
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_ExpenseFromEquitysettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets_loc" xlink:type="arc"/>
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets_loc" xlink:type="arc"/>
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees_loc" xlink:type="arc"/>
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_IncrementalFairValueGrantedModifiedSharebasedPaymentArrangements_loc" xlink:type="arc"/>
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_loc" xlink:type="arc"/>
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted_loc" xlink:type="arc"/>
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted_loc" xlink:type="arc"/>
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="sbr-dim_ValidationLineItems_loc" xlink:to="ifrs-full_WeightedAverageSharePriceShareOptionsGranted_loc" xlink:type="arc"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted" xlink:label="ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted_loc" xlink:type="locator"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DescriptionOfOptionLifeShareOptionsGranted" xlink:label="ifrs-full_DescriptionOfOptionLifeShareOptionsGranted_loc" xlink:type="locator"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted" xlink:label="ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted_loc" xlink:type="locator"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ExercisePriceShareOptionsGranted" xlink:label="ifrs-full_ExercisePriceShareOptionsGranted_loc" xlink:type="locator"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted" xlink:label="ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted_loc" xlink:type="locator"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ExpectedDividendShareOptionsGranted" xlink:label="ifrs-full_ExpectedDividendShareOptionsGranted_loc" xlink:type="locator"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ExpenseFromCashsettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets" xlink:label="ifrs-full_ExpenseFromCashsettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets_loc" xlink:type="locator"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ExpenseFromEquitysettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets" xlink:label="ifrs-full_ExpenseFromEquitysettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets_loc" xlink:type="locator"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets" xlink:label="ifrs-full_ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets_loc" xlink:type="locator"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:label="ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees_loc" xlink:type="locator"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_IncrementalFairValueGrantedModifiedSharebasedPaymentArrangements" xlink:label="ifrs-full_IncrementalFairValueGrantedModifiedSharebasedPaymentArrangements_loc" xlink:type="locator"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:label="ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_loc" xlink:type="locator"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted" xlink:label="ifrs-full_WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted_loc" xlink:type="locator"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted" xlink:label="ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted_loc" xlink:type="locator"/>
    <link:loc xlink:href="../../../iasb/20181212.a/dictionary/full_ifrs-cor_2018-03-16.xsd#ifrs-full_WeightedAverageSharePriceShareOptionsGranted" xlink:label="ifrs-full_WeightedAverageSharePriceShareOptionsGranted_loc" xlink:type="locator"/>
    <link:loc xlink:href="http://www.nltaxonomie.nl/2013/xbrl/sbr-dimensional-concepts.xsd#sbr-dim_ValidationLineItems" xlink:label="sbr-dim_ValidationLineItems_loc" xlink:type="locator"/>
  </link:definitionLink>
</link:linkbase>
