diff --git a/install/from-scratch.sh b/install/from-scratch.sh
index 2331df090b4abe69dc67bad1bf3e2df3b814a98e..112cbd9d7b6de85567914a30698a049d34007d3a 100755
--- a/install/from-scratch.sh
+++ b/install/from-scratch.sh
@@ -3,9 +3,10 @@
 
 set -e
 
-if [ "${#}" != 3 ]; then
-  echo "usage: `basename $0` <basedir> <name> <python-version> <bob-devel>"
-  echo "example: `basename $0` /opt/conda bob-devel-py35 3.5 2017.06.06"
+if [ "${#}" != 4 ]; then
+  p=`basename $0`
+  echo "usage: ${p} <basedir> <name> <python-version> <bob-devel-version>"
+  echo "example: ${p} /opt/conda bob-devel-py35 3.5 2017.06.20"
   exit 1
 fi
 
@@ -25,6 +26,6 @@ if [ -d ${BASEDIR}/envs/${NAME} ]; then
 fi
 
 echo "[>>] Creating environment ${NAME} for python ${PYTHON_VERSION} with bob dependencies..."
-${CONDA} create --yes --name=${NAME} --override-channels --channel=http://www.idiap.ch/software/bob/conda --channel=defaults python=${PYTHON_VERSION} bob-devel=${BOB_DEVEL}
+${CONDA} create --yes --name=${NAME} --override-channels --channel=http://www.idiap.ch/software/bob/conda --channel=defaults python=${PYTHON_VERSION} bob-devel=${BOB_DEVEL_VERSION}
 echo "[>>] Bye!"
 exit 0
diff --git a/install/install-ci.sh b/install/install-ci.sh
index 2c169be78c4b5dd2b0c75ec0a767d22c7eb92cda..d3640b961d7f4a9855207bb9d6db5a10041c31d4 100755
--- a/install/install-ci.sh
+++ b/install/install-ci.sh
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 # Sat 28 Jan 09:16:48 2017 CET
 
-if [ "${#}" != 1 ]; then
+if [ "${#}" != 2 ]; then
   echo "usage: `basename $0` <prefix> <bob-devel-version>"
-  echo "example: `basename $0` /opt/conda 2017.06.06"
+  echo "example: `basename $0` /opt/conda 2017.06.20"
   exit 1
 fi