diff --git a/nvm.sh b/nvm.sh
index 2053719..a594381 100644
--- a/nvm.sh
+++ b/nvm.sh
@@ -6,7 +6,7 @@
 # with much bash help from Matthew Ranney
 
 # Auto detect the NVM_DIR using magic bash 3.x stuff
-export NVM_DIR=$(dirname ${BASH_ARGV[0]})
+export NVM_DIR=$(cd $(dirname ${BASH_SOURCE[0]:-$0}); pwd)
 
 nvm()
 {