diff --git a/activesupport/lib/active_support/dependencies.rb b/activesupport/lib/active_support/dependencies.rb
index 64b2248e28..70b34c90e8 100644
--- a/activesupport/lib/active_support/dependencies.rb
+++ b/activesupport/lib/active_support/dependencies.rb
@@ -423,10 +423,12 @@ module Dependencies #:nodoc:
 
 protected
   def log_call(*args)
-    arg_str = args.collect(&:inspect) * ', '
-    /in `([a-z_\?\!]+)'/ =~ caller(1).first
-    selector = $1 || '<unknown>'
-    log "called #{selector}(#{arg_str})"
+    if defined?(RAILS_DEFAULT_LOGGER) && RAILS_DEFAULT_LOGGER && log_activity
+      arg_str = args.collect(&:inspect) * ', '
+      /in `([a-z_\?\!]+)'/ =~ caller(1).first
+      selector = $1 || '<unknown>'
+      log "called #{selector}(#{arg_str})"
+    end
   end
 
   def log(msg)