diff --git a/HxCFloppyEmulator_software/sources/thirdpartylibs/fltk/prepare_fltk.sh b/HxCFloppyEmulator_software/sources/thirdpartylibs/fltk/prepare_fltk.sh
index 3e7ce145..bcaf99f5 100644
--- a/HxCFloppyEmulator_software/sources/thirdpartylibs/fltk/prepare_fltk.sh
+++ b/HxCFloppyEmulator_software/sources/thirdpartylibs/fltk/prepare_fltk.sh
@@ -10,6 +10,7 @@ md5_check () {
 			return 1;
 		fi;
 	else
+		export LC_ALL=C
 		export valid_md5=`echo ${DOWNLOADHASH} ${ARCHIVENAMEBASE}.tar.gz | md5sum -c - | grep ": OK" | wc -l`
 
 		if [ "$valid_md5" -ne "1" ]; then