diff --git a/ct/apache-guacamole.sh b/ct/apache-guacamole.sh
index bbd9673cc..89f1b973b 100644
--- a/ct/apache-guacamole.sh
+++ b/ct/apache-guacamole.sh
@@ -146,7 +146,7 @@ function update_script() {
 
   # Check and upgrade optional extensions
   # TOTP Extension
-  if [[ -f /etc/guacamole/extensions/guacamole-auth-totp-*.jar ]]; then
+  if compgen -G "/etc/guacamole/extensions/guacamole-auth-totp-*.jar" >/dev/null; then
     msg_info "Updating TOTP Extension"
     rm -f /etc/guacamole/extensions/guacamole-auth-totp-*.jar
     curl_download "/tmp/guacamole-auth-totp.tar.gz" "https://downloads.apache.org/guacamole/${LATEST_SERVER}/binary/guacamole-auth-totp-${LATEST_SERVER}.tar.gz"
@@ -158,7 +158,7 @@ function update_script() {
   fi
 
   # DUO Extension
-  if [[ -f /etc/guacamole/extensions/guacamole-auth-duo-*.jar ]]; then
+  if compgen -G "/etc/guacamole/extensions/guacamole-auth-duo-*.jar" >/dev/null; then
     msg_info "Updating DUO Extension"
     rm -f /etc/guacamole/extensions/guacamole-auth-duo-*.jar
     curl_download "/tmp/guacamole-auth-duo.tar.gz" "https://downloads.apache.org/guacamole/${LATEST_SERVER}/binary/guacamole-auth-duo-${LATEST_SERVER}.tar.gz"
@@ -170,7 +170,7 @@ function update_script() {
   fi
 
   # LDAP Extension
-  if [[ -f /etc/guacamole/extensions/guacamole-auth-ldap-*.jar ]]; then
+  if compgen -G "/etc/guacamole/extensions/guacamole-auth-ldap-*.jar" >/dev/null; then
     msg_info "Updating LDAP Extension"
     rm -f /etc/guacamole/extensions/guacamole-auth-ldap-*.jar
     curl_download "/tmp/guacamole-auth-ldap.tar.gz" "https://downloads.apache.org/guacamole/${LATEST_SERVER}/binary/guacamole-auth-ldap-${LATEST_SERVER}.tar.gz"
@@ -182,7 +182,7 @@ function update_script() {
   fi
 
   # Quick Connect Extension
-  if [[ -f /etc/guacamole/extensions/guacamole-auth-quickconnect-*.jar ]]; then
+  if compgen -G "/etc/guacamole/extensions/guacamole-auth-quickconnect-*.jar" >/dev/null; then
     msg_info "Updating Quick Connect Extension"
     rm -f /etc/guacamole/extensions/guacamole-auth-quickconnect-*.jar
     curl_download "/tmp/guacamole-auth-quickconnect.tar.gz" "https://downloads.apache.org/guacamole/${LATEST_SERVER}/binary/guacamole-auth-quickconnect-${LATEST_SERVER}.tar.gz"
@@ -194,7 +194,7 @@ function update_script() {
   fi
 
   # History Recording Storage Extension
-  if [[ -f /etc/guacamole/extensions/guacamole-history-recording-storage-*.jar ]]; then
+  if compgen -G "/etc/guacamole/extensions/guacamole-history-recording-storage-*.jar" >/dev/null; then
     msg_info "Updating History Recording Storage Extension"
     rm -f /etc/guacamole/extensions/guacamole-history-recording-storage-*.jar
     curl_download "/tmp/guacamole-history-recording-storage.tar.gz" "https://downloads.apache.org/guacamole/${LATEST_SERVER}/binary/guacamole-history-recording-storage-${LATEST_SERVER}.tar.gz"