diff --git a/rakelib/tags.rake b/rakelib/tags.rake
index 93b47df..88ca323 100644
--- a/rakelib/tags.rake
+++ b/rakelib/tags.rake
@@ -12,7 +12,7 @@ module Tags
 
   PROJECT_DIR = ['.']
 
-  RVM_GEMDIR = File.join(`rvm gemdir`.strip, "gems")
+  RVM_GEMDIR = File.join(Gem.dir, "gems")
   SYSTEM_DIRS = File.exists?(RVM_GEMDIR) ? RVM_GEMDIR : []
 
   module_function