diff --git a/xorriso-dd-target/xorriso-dd-target b/xorriso-dd-target/xorriso-dd-target
index 10626d35..b83c372a 100755
--- a/xorriso-dd-target/xorriso-dd-target
+++ b/xorriso-dd-target/xorriso-dd-target
@@ -279,7 +279,7 @@ plug_in_watcher() {
     else
       for i in $new_device_list
       do
-        if echo "$old_device_list" | fgrep -v ' '"$i"' ' >/dev/null
+        if echo "$old_device_list" | grep -F -v ' '"$i"' ' >/dev/null
         then
           found_devices="$found_devices $i"
         fi
@@ -362,7 +362,7 @@ list_devices() {
     if echo "$name" | grep '^mmcblk[0-9]' >/dev/null
     then
       transports="mmcblk"
-    elif echo "$name" | fgrep "/" >/dev/null
+    elif echo "$name" | grep -F "/" >/dev/null
     then
       echo "NOTE: The device name must not contain '/' characters" >&2 
       transports=not_an_expected_name
@@ -388,7 +388,7 @@ list_devices() {
         then
           dummy=dummy
         else
-          if echo "$reasons" | fgrep -v "not_usb" >/dev/null
+          if echo "$reasons" | grep -F -v "not_usb" >/dev/null
           then
             reasons="${reasons}not_usb- "
           fi
@@ -419,21 +419,21 @@ list_devices() {
       if test "$fstype" = "iso9660"
       then
         has_iso=y
-        if echo "$good_fs" | fgrep -v "has_$fstype" >/dev/null
+        if echo "$good_fs" | grep -F -v "has_$fstype" >/dev/null
         then
           good_fs="${good_fs}has_${fstype}+ "
         fi
       elif test "$fstype" = "vfat"
       then
         has_vfat=y
-        if echo "$good_fs" | fgrep -v "has_$fstype" >/dev/null
+        if echo "$good_fs" | grep -F -v "has_$fstype" >/dev/null
         then
           good_fs="${good_fs}has_${fstype}+ "
         fi
       elif test -n "$fstype"
       then
         has_other=y
-        if echo "$bad_fs" | fgrep -v "has_$fstype" >/dev/null
+        if echo "$bad_fs" | grep -F -v "has_$fstype" >/dev/null
         then
           bad_fs="${bad_fs}has_${fstype}- "
         fi