diff --git a/backend/src/__fixtures__/mempool-config.template.json b/backend/src/__fixtures__/mempool-config.template.json
index 1b6c8d411..652536d7a 100644
--- a/backend/src/__fixtures__/mempool-config.template.json
+++ b/backend/src/__fixtures__/mempool-config.template.json
@@ -69,6 +69,7 @@
     "DATABASE": "__DATABASE_DATABASE__",
     "USERNAME": "__DATABASE_USERNAME__",
     "PASSWORD": "__DATABASE_PASSWORD__",
+    "PID_DIR": "__DATABASE_PID_FILE__",
     "TIMEOUT": 3000
   },
   "SYSLOG": {
diff --git a/docker/backend/mempool-config.json b/docker/backend/mempool-config.json
index 5642b36d3..457eccd4a 100644
--- a/docker/backend/mempool-config.json
+++ b/docker/backend/mempool-config.json
@@ -70,7 +70,7 @@
     "USERNAME": "__DATABASE_USERNAME__",
     "PASSWORD": "__DATABASE_PASSWORD__",
     "TIMEOUT": __DATABASE_TIMEOUT__,
-    "PID_DIR": "__PID_DIR__",
+    "PID_DIR": "__DATABASE_PID_DIR__",
   },
   "SYSLOG": {
     "ENABLED": __SYSLOG_ENABLED__,