diff --git a/src/grammar-registry.coffee b/src/grammar-registry.coffee
index b43e095d9..8272dce47 100644
--- a/src/grammar-registry.coffee
+++ b/src/grammar-registry.coffee
@@ -38,7 +38,7 @@ class GrammarRegistry extends FirstMate.GrammarRegistry
   selectGrammar: (filePath, fileContents) -> super
 
   clearObservers: ->
-    @off() if includeDeprecations
+    @off() if includeDeprecatedAPIs
     @emitter = new Emitter
 
 if includeDeprecatedAPIs