diff --git a/ubuntu_install_binary_c.sh b/ubuntu_install_binary_c.sh
index 5160d4de2068ac7466b607d6446415a3c36d3eaa..648f3a6a498e63e544190a987e49a7aeb581c07d 100755
--- a/ubuntu_install_binary_c.sh
+++ b/ubuntu_install_binary_c.sh
@@ -68,6 +68,10 @@ done
 mkdir -p $GITROOT
 cd $GITROOT
 
+############################################################
+# commands
+WGET="wget --no-check-certificate"
+
 ############################################################
 versionsorter() {
     [  "$1" = "`echo -e "$1\n$2" | sort -V | head -n1`" ]
@@ -167,7 +171,7 @@ function install_from_surrey_git
     # download and install $PACKAGE
     mkdir -p $GITROOT
     cd $GITROOT
-    wget https://gitlab.eps.surrey.ac.uk/ri0005/$PACKAGE/-/archive/master/$PACKAGE-master.zip -O $PACKAGE-master.zip
+    $WGET https://gitlab.eps.surrey.ac.uk/ri0005/$PACKAGE/-/archive/master/$PACKAGE-master.zip -O $PACKAGE-master.zip
     unzip -o $PACKAGE-master.zip
     cd $PACKAGE-master/
     if [ -d builddir ];
@@ -187,7 +191,7 @@ function install_binary_c_from_zip
     exit
     fi
     cd /tmp # work from /tmp
-    wget https://gitlab.eps.surrey.ac.uk/ri0005/binary_c/-/archive/master/binary_c-master.zip -O binary_c-master.zip
+    $WGET https://gitlab.eps.surrey.ac.uk/ri0005/binary_c/-/archive/master/binary_c-master.zip -O binary_c-master.zip
     unzip -o binary_c-master.zip
     rm binary_c-master.zip
     mv binary_c-master $BINARY_C
@@ -307,7 +311,7 @@ function download_MINT_data
     mkdir -p $HOME/data/MINT
     cd $HOME/data/MINT
     rm -f sync
-    wget http://personal.ph.surrey.ac.uk/~ri0005/MINT/sync
+    $WGET http://personal.ph.surrey.ac.uk/~ri0005/MINT/sync
     chmod +x sync
     ./sync
 }