diff --git a/build/installer.nsh b/build/installer.nsh
index 2c9c98c9..89693a5c 100644
--- a/build/installer.nsh
+++ b/build/installer.nsh
@@ -1,4 +1,6 @@
 !macro customUnInstall
-  RMDir /r "$APPDATA\${APP_PACKAGE_NAME}"
-  RMDir /r "$APPDATA\hydra"
+  ${ifNot} ${isUpdated}
+    RMDir /r "$APPDATA\${APP_PACKAGE_NAME}"
+    RMDir /r "$APPDATA\hydra"
+  ${endIf}
 !macroend