diff --git a/lib/rails-html-sanitizer.rb b/lib/rails-html-sanitizer.rb
index f8d1736..39ac71d 100644
--- a/lib/rails-html-sanitizer.rb
+++ b/lib/rails-html-sanitizer.rb
@@ -21,7 +21,7 @@ def safe_list_sanitizer
 
         def white_list_sanitizer
           ActiveSupport::Deprecation.warn "warning: white_list_sanitizer is" \
-          "deprecated, please use safe_list_sanitizer instead."
+          " deprecated, please use safe_list_sanitizer instead."
           safe_list_sanitizer
         end
       end