diff --git a/env.sh b/env.sh
index e6e365c..36554a9 100755
--- a/env.sh
+++ b/env.sh
@@ -11,6 +11,6 @@ export AWS_SECRET_KEY=your_AWS_SECRET_KEY
 ############################################
 
 # set EC2_HOME and add $EC2_HOME/bin to $PATH
-export EC2_HOME=./external_tools/ec2-api-tools-1.6.1.4
+export EC2_HOME=`pwd`/external_tools/ec2-api-tools-1.6.1.4
 export PATH=$PATH:$EC2_HOME/bin