diff --git a/build/installer.nsh b/build/installer.nsh
index 8ff35b5e4f..d0fe18809a 100644
--- a/build/installer.nsh
+++ b/build/installer.nsh
@@ -1,4 +1,7 @@
 !macro customInit
+  ; Make sure all old extensions are removed
+  RMDir /r "$INSTDIR\resources\extensions"
+
   ; Workaround for installer handing when the app directory is removed manually
   ${ifNot} ${FileExists} "$INSTDIR"
     DeleteRegKey HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\{${UNINSTALL_APP_KEY}}"