diff --git a/script/install_Metis.sh b/script/install_Metis.sh
index 0fab273ebbb3214cadd6493ad902704a5066773f..9befb5871a8b7cfbdd76aec1da733e533ac35f7f 100755
--- a/script/install_Metis.sh
+++ b/script/install_Metis.sh
@@ -15,12 +15,13 @@ systype=$(uname -s)
 BUILDDIR=build/$systype-$cputype
 mkdir -p $BUILDDIR
 cd $BUILDDIR
-if [ x"$2"==x"" -a x"$3"==x"" ]; then
+if [ "$#" -eq 3 ]; then
   echo "cmake ../../ $CURDIR -DSHARED=1 -DCMAKE_INSTALL_PREFIX=$1/METIS -DCMAKE_C_COMPILER=$2 -DCMAKE_CXX_COMPILER=$3"
+  cmake ../../ $CURDIR -DSHARED=1 -DCMAKE_INSTALL_PREFIX=$1/METIS -DCMAKE_C_COMPILER=$2 -DCMAKE_CXX_COMPILER=$3
 else
   echo "cmake ../../ $CURDIR -DSHARED=1 -DCMAKE_INSTALL_PREFIX=$1/METIS"
+  cmake ../../ $CURDIR -DSHARED=1 -DCMAKE_INSTALL_PREFIX=$1/METIS
 fi
-cmake ../../ $CURDIR -DSHARED=1 -DCMAKE_INSTALL_PREFIX=$1/METIS -DCMAKE_C_COMPILER=$2 -DCMAKE_CXX_COMPILER=$3
 make -j 4
 mkdir $1/METIS
 make install