diff --git a/.gitea/scripts/common.sh b/.gitea/scripts/common.sh
index d681b86..387a396 100644
--- a/.gitea/scripts/common.sh
+++ b/.gitea/scripts/common.sh
@@ -5,6 +5,23 @@
 # Overridable so the scripts can be exercised outside of the runner
 HLA_ROOT=${HLA_ROOT:-/sls/bd/hla}
 
+# Sets AGEBD_ENV_SUFFIX_UPPER/LOWER for the given environment.
+# Usage: set_env_suffix <dev|prod>
+set_env_suffix() {
+    local ENV=$1
+
+    if [ "${ENV}" = "dev" ]; then
+        AGEBD_ENV_SUFFIX_UPPER="-DEV"
+        AGEBD_ENV_SUFFIX_LOWER="-dev"
+    elif [ "${ENV}" = "prod" ]; then
+        AGEBD_ENV_SUFFIX_UPPER=""
+        AGEBD_ENV_SUFFIX_LOWER=""
+    else
+        echo "Unknown environment '${ENV}', expected 'dev' or 'prod'" >&2
+        exit 1
+    fi
+}
+
 # Sets the naming and path variables used by the deploy and ioc scripts.
 # Usage: init_service_env <service-name> <dev|prod>
 init_service_env() {
@@ -16,16 +33,7 @@ init_service_env() {
         exit 1
     fi
 
-    if [ "${AGEBD_ENV}" = "dev" ]; then
-        AGEBD_ENV_SUFFIX_UPPER="-DEV"
-        AGEBD_ENV_SUFFIX_LOWER="-dev"
-    elif [ "${AGEBD_ENV}" = "prod" ]; then
-        AGEBD_ENV_SUFFIX_UPPER=""
-        AGEBD_ENV_SUFFIX_LOWER=""
-    else
-        echo "Unknown environment '${AGEBD_ENV}', expected 'dev' or 'prod'" >&2
-        exit 1
-    fi
+    set_env_suffix "${AGEBD_ENV}"
 
     SERVICE_NAME_LOWER=$(echo "${SERVICE_NAME}" | tr '[:upper:]' '[:lower:]')
     SERVICE_NAME_UPPER=$(echo "${SERVICE_NAME}" | tr '[:lower:]' '[:upper:]')
diff --git a/.gitea/workflows/deploy.yml b/.gitea/workflows/deploy.yml
index ef7e9ff..b97a9b4 100644
--- a/.gitea/workflows/deploy.yml
+++ b/.gitea/workflows/deploy.yml
@@ -116,6 +116,12 @@ jobs:
             --exclude='.pytest_cache/' \
             ./qt/* "${DEST_DIR}/"
 
+          ### SUBSTITUTIONS
+          source "${{ github.workspace }}/.gitea/scripts/common.sh"
+          set_env_suffix "${AGEBD_ENV}"
+          sed -i "s/{{ *agebd_env_suffix_upper* }}/${AGEBD_ENV_SUFFIX_UPPER}/g" "${DEST_DIR}/"*
+          sed -i "s/{{ *agebd_env_suffix_lower* }}/${AGEBD_ENV_SUFFIX_LOWER}/g" "${DEST_DIR}/"*
+
       # -----------------------------------------------------------------
       # Services Detection, Testing, and Deployment
       # -----------------------------------------------------------------