diff --git a/ct/fluid-calendar.sh b/ct/fluid-calendar.sh
index 47bf479f0..3b8a89c65 100644
--- a/ct/fluid-calendar.sh
+++ b/ct/fluid-calendar.sh
@@ -29,6 +29,7 @@ function update_script() {
     exit
   fi
 
+  ensure_dependencies build-essential
   NODE_VERSION="24" setup_nodejs
 
   if check_for_gh_release "fluid-calendar" "dotnetfactory/fluid-calendar"; then
diff --git a/install/fluid-calendar-install.sh b/install/fluid-calendar-install.sh
index 9fa132702..3f20f0a8b 100644
--- a/install/fluid-calendar-install.sh
+++ b/install/fluid-calendar-install.sh
@@ -14,7 +14,9 @@ network_check
 update_os
 
 msg_info "Installing Dependencies"
-$STD apt install -y zip
+$STD apt install -y \
+  build-essential \
+  zip
 msg_ok "Installed Dependencies"
 
 PG_VERSION="17" setup_postgresql