diff --git a/script/install_Parmetis.sh b/script/install_Parmetis.sh
index 17cd3a99dcc5c590a75e435e59ffb2cc039540ce..56abb4b2a0f628f735e9f15fc5aa1b9bf98a5541 100755
--- a/script/install_Parmetis.sh
+++ b/script/install_Parmetis.sh
@@ -1,5 +1,8 @@
 #! /bin/bash
 
+source script/discover_os
+discover_os
+
 # check if the directory $1/PARMETIS exist
 
 if [ -d "$1/PARMETIS" ]; then
@@ -23,8 +26,6 @@ fi
 
 $sed_command -i "/#define\sIDXTYPEWIDTH\s32/c\#define IDXTYPEWIDTH 64" metis/include/metis.h
 
-sed #define IDXTYPEWIDTH 32
-
 make config prefix=$1/PARMETIS
 make -j $2
 if [ $? -ne 0 ]; then