diff --git a/etc/bashrc b/etc/bashrc
index e107f57f7f..8b59bc22ce 100644
--- a/etc/bashrc
+++ b/etc/bashrc
@@ -43,7 +43,7 @@ export WM_PROJECT_VERSION=dev
 # Please set to the appropriate path if the default is not correct.
 #
 [ $BASH_SOURCE ] && \
-export FOAM_INST_DIR=$(cd ${BASH_SOURCE%/*/*/*} && pwd -P) || \
+export FOAM_INST_DIR=$(cd $(dirname $BASH_SOURCE)/../.. && pwd -P) || \
 export FOAM_INST_DIR=$HOME/$WM_PROJECT
 # export FOAM_INST_DIR=~$WM_PROJECT
 # export FOAM_INST_DIR=/opt/$WM_PROJECT