diff --git a/helper.zsh b/helper.zsh
index f4153ce..1df159a 100644
--- a/helper.zsh
+++ b/helper.zsh
@@ -4,7 +4,7 @@ function autoloadable() {
 }
 
 # Checks boolean variable for "true" (case insensitive "1", "y", "yes", "t", "true", "o", and "on").
-function check-bool {
+function check-bool() {
   [[ -n "$1" && "$1" == (1|[Yy]([Ee][Ss]|)|[Tt]([Rr][Uu][Ee]|)|[Oo]([Nn]|)) ]]
 }
 
@@ -17,7 +17,7 @@ TRAP_SIGNALS=(
 )
 
 # Adds a function to a list to be called when a trap is triggered.
-function add-zsh-trap {
+function add-zsh-trap() {
   if (( $# < 2 )); then
     print "Usage: $0 type function"
     return 1
diff --git a/terminal.zsh b/terminal.zsh
index 570307f..4408756 100644
--- a/terminal.zsh
+++ b/terminal.zsh
@@ -69,7 +69,7 @@ function set-title-by-command() {
 autoload -Uz add-zsh-hook
 
 # Sets the tab and window titles before the prompt is displayed.
-function set-title-precmd {
+function set-title-precmd() {
   if [[ "$TERM_PROGRAM" != "Apple_Terminal" ]] && zstyle -t ':omz:terminal' auto-title; then
     set-window-title "${(%):-%~}"
     for kind in tab screen; do
@@ -84,7 +84,7 @@ function set-title-precmd {
 add-zsh-hook precmd set-title-precmd
 
 # Sets the tab and window titles before command execution.
-function set-title-preexec {
+function set-title-preexec() {
   if zstyle -t ':omz:terminal' auto-title; then
     set-title-by-command "$2"
   fi