diff --git a/contrib/reresolve-dns/reresolve-dns.sh b/contrib/reresolve-dns/reresolve-dns.sh
index 274aed8..7f913ab 100755
--- a/contrib/reresolve-dns/reresolve-dns.sh
+++ b/contrib/reresolve-dns/reresolve-dns.sh
@@ -9,8 +9,8 @@ shopt -s extglob
 export LC_ALL=C
 
 CONFIG_FILE="$1"
-[[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,16}$ ]] && CONFIG_FILE="/etc/wireguard/$CONFIG_FILE.conf"
-[[ $CONFIG_FILE =~ /?([a-zA-Z0-9_=+.-]{1,16})\.conf$ ]]
+[[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,15}$ ]] && CONFIG_FILE="/etc/wireguard/$CONFIG_FILE.conf"
+[[ $CONFIG_FILE =~ /?([a-zA-Z0-9_=+.-]{1,15})\.conf$ ]]
 INTERFACE="${BASH_REMATCH[1]}"
 
 process_peer() {
diff --git a/src/wg-quick.8 b/src/wg-quick.8
index 2039094..ceffb0d 100644
--- a/src/wg-quick.8
+++ b/src/wg-quick.8
@@ -97,7 +97,7 @@ interface upon shutdown.
 .P
 Recommended \fIINTERFACE\fP names include `wg0' or `wgvpn0' or even `wgmgmtlan0'.
 However, the number at the end is in fact optional, and really
-any free-form string [a-zA-Z0-9_=+.-]{1,16} will work. So even interface names corresponding
+any free-form string [a-zA-Z0-9_=+.-]{1,15} will work. So even interface names corresponding
 to geographic locations would suffice, such as `cincinnati', `nyc', or `paris', if that's
 somehow desirable.
 
diff --git a/src/wg-quick.bash b/src/wg-quick.bash
index aceeebc..a028b98 100755
--- a/src/wg-quick.bash
+++ b/src/wg-quick.bash
@@ -29,9 +29,9 @@ ARGS=( "$@" )
 parse_options() {
 	local interface_section=0 line key value
 	CONFIG_FILE="$1"
-	[[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,16}$ ]] && CONFIG_FILE="/etc/wireguard/$CONFIG_FILE.conf"
+	[[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,15}$ ]] && CONFIG_FILE="/etc/wireguard/$CONFIG_FILE.conf"
 	[[ -e $CONFIG_FILE ]] || die "\`$CONFIG_FILE' does not exist"
-	[[ $CONFIG_FILE =~ /?([a-zA-Z0-9_=+.-]{1,16})\.conf$ ]] || die "The config file must be a valid interface name, followed by .conf"
+	[[ $CONFIG_FILE =~ /?([a-zA-Z0-9_=+.-]{1,15})\.conf$ ]] || die "The config file must be a valid interface name, followed by .conf"
 	CONFIG_FILE="$(readlink -f "$CONFIG_FILE")"
 	((($(stat -c '0%#a' "$CONFIG_FILE") & $(stat -c '0%#a' "${CONFIG_FILE%/*}") & 0007) == 0)) || echo "Warning: \`$CONFIG_FILE' is world accessible" >&2
 	INTERFACE="${BASH_REMATCH[1]}"