diff --git a/install_pmodules.sh b/install_pmodules.sh
index 665117d..3ce2ea1 100755
--- a/install_pmodules.sh
+++ b/install_pmodules.sh
@@ -1,7 +1,6 @@
 #!/bin/bash
 declare    BOOTSTRAP_DIR=$(dirname "$0")
 
-unset PMODULES_ROOT
 unset PMODULES_HOME
 unset PMODULES_VERSION