diff --git a/simple-ca.sh b/simple-ca.sh
index e122cc9..ec9743b 100755
--- a/simple-ca.sh
+++ b/simple-ca.sh
@@ -39,7 +39,7 @@
 
 SIMPLE_CA_DIR="${SIMPLE_CA_DIR:-}"
 
-function _rebuild_ca_bundle() {
+_rebuild_ca_bundle() {
     local BUNDLE="$SIMPLE_CA_DIR/ca_bundle.pem"
     cat "$SIMPLE_CA_DIR/ca_cert.pem" > "$BUNDLE"
     for issuing_ca_dir in $SIMPLE_CA_DIR/*; do
@@ -49,7 +49,7 @@ function _rebuild_ca_bundle() {
     done
 }
 
-function _require_ca_dir() {
+_require_ca_dir() {
     SIMPLE_CA_DIR="${SIMPLE_CA_DIR:-$(pwd)}"
     if [[ ! -d "$SIMPLE_CA_DIR" ]]; then
         echo "ERROR: CA directory '$SIMPLE_CA_DIR' does not exist." >&2
@@ -57,10 +57,10 @@ function _require_ca_dir() {
     fi
 }
 
-function _is_ip()  { [[ "$1" =~ ^[0-9]{1,3}(\.[0-9]{1,3}){3}$ ]]; }
-function _is_dns() { [[ "$1" =~ ^[a-z0-9-]+(\.[a-z0-9-]+)*$ ]]; }
+_is_ip()  { [[ "$1" =~ ^[0-9]{1,3}(\.[0-9]{1,3}){3}$ ]]; }
+_is_dns() { [[ "$1" =~ ^[a-z0-9-]+(\.[a-z0-9-]+)*$ ]]; }
 
-function make_ca() {
+make_ca() {
     local CA_DAYS=3650
     local ISSUING_CA=""
     local AIA_BASE_URL=""
@@ -183,7 +183,7 @@ function make_ca() {
     return 0
 }
 
-function make_cert() {
+make_cert() {
     local ISSUING_CA=""
     local CERT_DAYS=365
     local CERT_DIR=""
@@ -304,7 +304,7 @@ function make_cert() {
     fi
 }
 
-function make_pfx() {
+make_pfx() {
     local ISSUING_CA=""
     local PFX_PASSWORD=""
     local APPLE_OPENSSL=0