diff --git a/oe-init-build-env-memres b/oe-init-build-env-memres
index 9b9e0f44b0..c1dc4fe3ef 100755
--- a/oe-init-build-env-memres
+++ b/oe-init-build-env-memres
@@ -32,28 +32,33 @@ else
     port=$1
     shift
 fi
-if [ -z "$ZSH_NAME" ] && [ "x$0" = "x./oe-init-build-env" ]; then
-   echo "Error: This script needs to be sourced. Please run as '. ./oe-init-build-env'"
+
+if [ -n "$BASH_SOURCE" ]; then
+  OEROOT="`dirname $BASH_SOURCE`"
+elif [ -n "$ZSH_NAME" ]; then
+  OEROOT="`dirname $0`"
 else
-   if [ -n "$BASH_SOURCE" ]; then
-      OEROOT="`dirname $BASH_SOURCE`"
-   elif [ -n "$ZSH_NAME" ]; then
-      OEROOT="`dirname $0`"
-   else
-      OEROOT="`pwd`"
-   fi
-   if [ -n "$BBSERVER" ]; then
-      unset BBSERVER
-   fi
-            
-   OEROOT=`readlink -f "$OEROOT"`
-   export OEROOT
-   . $OEROOT/scripts/oe-buildenv-internal && \
-        $OEROOT/scripts/oe-setup-builddir && \
-        [ -n "$BUILDDIR" ] && cd $BUILDDIR
-   unset OEROOT
-   unset BBPATH
+  OEROOT="`pwd`"
 fi
+if [ -n "$BBSERVER" ]; then
+  unset BBSERVER
+fi
+
+THIS_SCRIPT=$OEROOT/oe-init-build-env-memres
+if [ -z "$ZSH_NAME" ] && [ "x$0" = "x$THIS_SCRIPT" ]; then
+   echo "Error: This script needs to be sourced. Please run as '. $THIS_SCRIPT'"
+   exit 1
+fi
+
+OEROOT=`readlink -f "$OEROOT"`
+export OEROOT
+. $OEROOT/scripts/oe-buildenv-internal && \
+    $OEROOT/scripts/oe-setup-builddir && \
+    [ -n "$BUILDDIR" ] && cd $BUILDDIR
+unset OEROOT
+unset BBPATH
+unset THIS_SCRIPT
+
 res=1
 if [ -e bitbake.lock ] && grep : bitbake.lock > /dev/null ; then
     BBSERVER=`cat bitbake.lock` bitbake --status-only