diff --git a/.docker/Dockerfile.php b/.docker/Dockerfile.php
index 0b56e48f9..5e1fe43d7 100644
--- a/.docker/Dockerfile.php
+++ b/.docker/Dockerfile.php
@@ -5,6 +5,7 @@
 FROM uselagoon/php-8.3-fpm:${LAGOON_IMAGE_VERSION}
 
 COPY .docker/images/php/01-govcms.ini /usr/local/etc/php/conf.d/
+COPY .docker/images/php/99-httpav-id.conf /usr/local/etc/php-fpm.d/99-httpav-id.conf
 COPY --from=cli /app /app
 COPY .docker/sanitize.sh /app/sanitize.sh
 
diff --git a/.docker/images/php/99-httpav-id.conf b/.docker/images/php/99-httpav-id.conf
new file mode 100644
index 000000000..a07daaa60
--- /dev/null
+++ b/.docker/images/php/99-httpav-id.conf
@@ -0,0 +1,5 @@
+; HTTPAV identifier passed into PHP for FPM requests (not visible to CLI/php -r).
+; Expanded at container start by envplate (see Lagoon 70-php-config.sh) from Lagoon’s
+; project and environment names. Pool name must match the active pool (usually www).
+[www]
+env[HTTPAV_IDENTIFIER] = ${LAGOON_PROJECT}-${LAGOON_ENVIRONMENT}