diff --git a/src/vmm_mad/ec2/one_vmm_ec2.rb b/src/vmm_mad/ec2/one_vmm_ec2.rb
index b8bfedaf5d..10441c1115 100755
--- a/src/vmm_mad/ec2/one_vmm_ec2.rb
+++ b/src/vmm_mad/ec2/one_vmm_ec2.rb
@@ -52,7 +52,7 @@ class EC2Driver < VirtualMachineDriver
         :terminate => "#{EC2_LOCATION}/bin/ec2-terminate-instances",
         :describe  => "#{EC2_LOCATION}/bin/ec2-describe-instances",
         :associate => "#{EC2_LOCATION}/bin/ec2-associate-address",
-        :authorize => "#{EC2_LOCATION}bin/ec2-authorize"
+        :authorize => "#{EC2_LOCATION}/bin/ec2-authorize"
     }
 
     # EC2 constructor, loads defaults for the EC2Driver