diff --git a/toolkit/mozapps/installer/windows/install_sub.pl b/toolkit/mozapps/installer/windows/install_sub.pl
index abcc9a07b8ef..2de0f992a483 100755
--- a/toolkit/mozapps/installer/windows/install_sub.pl
+++ b/toolkit/mozapps/installer/windows/install_sub.pl
@@ -301,8 +301,8 @@ sub BuildPlatformInstaller
     system("7z a -r -t7z $dosDistInstall/nsis/app.7z -mx -m0=BCJ2 -m1=LZMA:d24 -m2=LZMA:d19 -m3=LZMA:d19  -mb0:1 -mb0s1:2 -mb0s2:3") &&
       die "7z failed: $!";
 
-    system("upx --best -o $dosDistInstall/nsis/7zSD.sfx $dostopsrcdir/other-licenses/7zstub/firefox/7zSD.sfx") &&
-      die "'upx --best -o $dosDistInstall/nsis/7zSD.sfx $dostopsrcdir/other-licenses/7zstub/firefox/7zSD.sfx' failed: $!";
+    system("upx --best -o $dosDistInstall/nsis/7zSD.sfx $dostopsrcdir/$ENV{WIZ_sfxModule}") &&
+      die "'upx --best -o $dosDistInstall/nsis/7zSD.sfx $dostopsrcdir/$ENV{WIZ_sfxModule}' failed: $!";
 
     # Temporary name change to include -nsis before .exe
     $nsisFileNameSpecific = $seiFileNameSpecific;