diff --git a/src/atom-package.coffee b/src/atom-package.coffee
index 240bb97f3..588be8e91 100644
--- a/src/atom-package.coffee
+++ b/src/atom-package.coffee
@@ -171,6 +171,7 @@ class AtomPackage extends Package
     syntax.removeProperties(scopedPropertiesPath) for [scopedPropertiesPath] in @scopedProperties
     keymap.remove(keymapPath) for [keymapPath] in @keymaps
     atom.themes.removeStylesheet(stylesheetPath) for [stylesheetPath] in @stylesheets
+    @stylesheetsActivated = false
 
   reloadStylesheets: ->
     oldSheets = _.clone(@stylesheets)