--- a/toolkit/mozapps/installer/windows/nsis/common.nsh
+++ b/toolkit/mozapps/installer/windows/nsis/common.nsh
@@ -7410,18 +7410,17 @@
 
 !define ITBL3SetProgressValue "!insertmacro ITBL3SetProgressValueCall"
 !define un.ITBL3SetProgressValue "!insertmacro ITBL3SetProgressValueCall"
 
 !macro ITBL3SetProgressValue_
   Exch $R9
   Exch 1
   Exch $R8
-  ${If} ${AtLeastWin7}
-  ${AndIf} $ITaskbarList3 <> 0
+  ${If} $ITaskbarList3 <> 0
     System::Call "${ITaskbarList3->SetProgressValue}(i$HWNDPARENT, l$R8, l$R9)"
   ${EndIf}
   Exch $R8
   Exch 1
   Exch $R9
 !macroend
 
 ; Normal state / no progress bar
@@ -7450,18 +7449,17 @@
   ${CallArtificialFunction} ITBL3SetProgressState_
 !macroend
 
 !define ITBL3SetProgressState "!insertmacro ITBL3SetProgressStateCall"
 !define un.ITBL3SetProgressState "!insertmacro ITBL3SetProgressStateCall"
 
 !macro ITBL3SetProgressState_
   Exch $R9
-  ${If} ${AtLeastWin7}
-  ${AndIf} $ITaskbarList3 <> 0
+  ${If} $ITaskbarList3 <> 0
     System::Call "${ITaskbarList3->SetProgressState}(i$HWNDPARENT, i$R9)"
   ${EndIf}
   Exch $R9
 !macroend
 
 ################################################################################
 # Helpers for the new user interface