diff --git a/setup/installer/windows/wix-template.xml b/setup/installer/windows/wix-template.xml
index 37dd8b25a8..b5d2f4b292 100644
--- a/setup/installer/windows/wix-template.xml
+++ b/setup/installer/windows/wix-template.xml
@@ -11,7 +11,10 @@
 						SummaryCodepage='1252' />
 
                 <Media Id="1" Cabinet="{app}.cab" CompressionLevel="{compression}" EmbedCab="yes" />
-                
+                <!-- The following line is needed because of the patch to QtCore4.dll. You can remove this line
+                     after you update Qt beyond 4.7.2. 'emus' means re-install even if version is the same not just if it is older. -->
+                <Property Id='REINSTALLMODE' Value='emus'/>
+
                 <Upgrade Id="{upgrade_code}">
                     <UpgradeVersion Maximum="{version}"
                        IncludeMaximum="yes"