diff --git a/scripts/check_tmux_version.sh b/scripts/check_tmux_version.sh
index b0aedec..f257936 100755
--- a/scripts/check_tmux_version.sh
+++ b/scripts/check_tmux_version.sh
@@ -1,78 +1,23 @@
 #!/usr/bin/env bash
 
-VERSION="$1"
-UNSUPPORTED_MSG="$2"
+CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
-get_tmux_option() {
-	local option=$1
-	local default_value=$2
-	local option_value=$(tmux show-option -gqv "$option")
-	if [ -z "$option_value" ]; then
-		echo "$default_value"
-	else
-		echo "$option_value"
-	fi
-}
-
-# Ensures a message is displayed for 5 seconds in tmux prompt.
-# Does not override the 'display-time' tmux option.
-display_message() {
-	local message="$1"
-
-	# display_duration defaults to 5 seconds, if not passed as an argument
-	if [ "$#" -eq 2 ]; then
-		local display_duration="$2"
-	else
-		local display_duration="5000"
-	fi
-
-	# saves user-set 'display-time' option
-	local saved_display_time=$(get_tmux_option "display-time" "750")
-
-	# sets message display time to 5 seconds
-	tmux set-option -gq display-time "$display_duration"
-
-	# displays message
-	tmux display-message "$message"
-
-	# restores original 'display-time' value
-	tmux set-option -gq display-time "$saved_display_time"
-}
+source "$CURRENT_DIR/variables.sh"
+source "$CURRENT_DIR/shared.sh"
 
 # this is used to get "clean" integer version number. Examples:
 # `tmux 1.9` => `19`
 # `1.9a`     => `19`
 get_digits_from_string() {
-	local string="$1"
-	local only_digits="$(echo "$string" | tr -dC '[:digit:]')"
-	echo "$only_digits"
+	echo "$1" | tr -dC '[:digit:]'
 }
 
-tmux_version_int() {
-	local tmux_version_string=$(tmux -V)
-	echo "$(get_digits_from_string "$tmux_version_string")"
-}
-
-unsupported_version_message() {
-	if [ -n "$UNSUPPORTED_MSG" ]; then
-		echo "$UNSUPPORTED_MSG"
-	else
-		echo "Error, Tmux version unsupported! Please install Tmux version $VERSION or greater!"
-	fi
-}
-
-exit_if_unsupported_version() {
-	local current_version="$1"
-	local supported_version="$2"
-	if [ "$current_version" -lt "$supported_version" ]; then
-		display_message "$(unsupported_version_message)"
+main() {
+	local supported_version_int="$(get_digits_from_string "$SUPPORTED_VERSION")"
+	local current_version_int="$(get_digits_from_string "$(tmux -V)")"
+	if [ "$current_version_int" -lt "$supported_version_int" ]; then
+		display_message "Error, Tmux version unsupported! Please install Tmux version $SUPPORTED_VERSION or greater!"
 		exit 1
 	fi
 }
-
-main() {
-	local supported_version_int="$(get_digits_from_string "$VERSION")"
-	local current_version_int="$(tmux_version_int)"
-	exit_if_unsupported_version "$current_version_int" "$supported_version_int"
-}
 main
diff --git a/scripts/shared.sh b/scripts/shared.sh
index 8b316d1..90f6c0a 100644
--- a/scripts/shared.sh
+++ b/scripts/shared.sh
@@ -41,7 +41,7 @@ remove_empty_lines_from_end_of_file() {
 }
 
 supported_tmux_version_ok() {
-	$CURRENT_DIR/check_tmux_version.sh "$SUPPORTED_VERSION"
+	$CURRENT_DIR/check_tmux_version.sh
 }
 
 # Checking full path to logfile and expanding tmux format in normal path