diff --git a/src/atom-package.coffee b/src/atom-package.coffee
index b0a187a3a..b44b4233e 100644
--- a/src/atom-package.coffee
+++ b/src/atom-package.coffee
@@ -73,21 +73,6 @@ class AtomPackage extends Package
 
     @activationDeferred.promise
 
-  # Deprecated
-  activateSync: ({immediate}={}) ->
-    @activateResources()
-    if @metadata.activationEvents? and not immediate
-      @subscribeToActivationEvents()
-    else
-      try
-        @activateConfig()
-        @activateStylesheets()
-        if @requireMainModule()
-          @mainModule.activate(atom.packages.getPackageState(@name) ? {})
-          @mainActivated = true
-      catch e
-        console.warn "Failed to activate package named '#{@name}'", e.stack
-
   activateNow: ->
     try
       @activateConfig()
diff --git a/src/package-manager.coffee b/src/package-manager.coffee
index 03052512f..52ea5fedc 100644
--- a/src/package-manager.coffee
+++ b/src/package-manager.coffee
@@ -81,26 +81,15 @@ class PackageManager
     @observeDisabledPackages()
 
   # Activate a single package by name
-  activatePackage: (name, options={}) ->
-    if options.sync? or options.immediate?
-      return @activatePackageSync(name, options)
-
+  activatePackage: (name) ->
     if pack = @getActivePackage(name)
       Q(pack)
     else
       pack = @loadPackage(name)
-      pack.activate(options).then =>
+      pack.activate().then =>
         @activePackages[pack.name] = pack
         pack
 
-  # Deprecated
-  activatePackageSync: (name, options) ->
-    return pack if pack = @getActivePackage(name)
-    if pack = @loadPackage(name)
-      @activePackages[pack.name] = pack
-      pack.activateSync(options)
-      pack
-
   # Deactivate all packages
   deactivatePackages: ->
     @deactivatePackage(pack.name) for pack in @getLoadedPackages()