diff --git a/todo.sh b/todo.sh
index 9bf6393..5348200 100755
--- a/todo.sh
+++ b/todo.sh
@@ -1252,7 +1252,7 @@ case $action in
         actionUsage "$@"
     else
         if [ -t 1 ] ; then # STDOUT is a TTY
-            if which "${PAGER:-less}" >/dev/null 2>&1; then
+            if command -v "${PAGER:-less}" >/dev/null 2>&1; then
                 # we have a working PAGER (or less as a default)
                 help | "${PAGER:-less}" && exit 0
             fi
@@ -1263,7 +1263,7 @@ case $action in
 
 "shorthelp" )
     if [ -t 1 ] ; then # STDOUT is a TTY
-        if which "${PAGER:-less}" >/dev/null 2>&1; then
+        if command -v "${PAGER:-less}" >/dev/null 2>&1; then
             # we have a working PAGER (or less as a default)
             shorthelp | "${PAGER:-less}" && exit 0
         fi