diff --git a/src/cli/index.js b/src/cli/index.js
index 8f62da1..e25fc09 100644
--- a/src/cli/index.js
+++ b/src/cli/index.js
@@ -63,6 +63,11 @@ module.exports = function () {
         description: 'Set database id property (e.g. _id)',
         default: 'id'
       },
+      foreignKeySuffix: {
+        alias: 'f',
+        description: 'Set foreign key suffix, (e.g. _id as in post_id)',
+        default: 'Id'
+      },
       quiet: {
         alias: 'q',
         description: 'Suppress log messages from output'
diff --git a/src/cli/run.js b/src/cli/run.js
index a67d730..59b53d6 100644
--- a/src/cli/run.js
+++ b/src/cli/run.js
@@ -42,9 +42,8 @@ function createApp (source, object, routes, middlewares, argv) {
 
   try {
     router = jsonServer.router(
-      is.JSON(source)
-      ? source
-      : object
+      is.JSON(source) ? source : object,
+      argv
     )
   } catch (e) {
     console.log()
diff --git a/src/server/router/index.js b/src/server/router/index.js
index 272cd1f..e577c6f 100644
--- a/src/server/router/index.js
+++ b/src/server/router/index.js
@@ -11,7 +11,7 @@ const nested = require('./nested')
 const singular = require('./singular')
 const mixins = require('../mixins')
 
-module.exports = (source) => {
+module.exports = (source, argv) => {
   // Create router
   const router = express.Router()
 
@@ -60,7 +60,7 @@ module.exports = (source) => {
     }
 
     if (_.isArray(value)) {
-      router.use(`/${key}`, plural(db, key))
+      router.use(`/${key}`, plural(db, key, argv))
       return
     }
 
diff --git a/src/server/router/plural.js b/src/server/router/plural.js
index d94c5d4..fd8d998 100644
--- a/src/server/router/plural.js
+++ b/src/server/router/plural.js
@@ -5,7 +5,7 @@ const write = require('./write')
 const getFullURL = require('./get-full-url')
 const utils = require('../utils')
 
-module.exports = (db, name) => {
+module.exports = (db, name, argv) => {
   // Create router
   const router = express.Router()
 
@@ -16,7 +16,7 @@ module.exports = (db, name) => {
         if (db.get(externalResource).value) {
           const query = {}
           const singularResource = pluralize.singular(name)
-          query[`${singularResource}Id`] = resource.id
+          query[`${singularResource}${argv.foreignKeySuffix}`] = resource.id
           resource[externalResource] = db.get(externalResource).filter(query).value()
         }
       })
@@ -28,7 +28,7 @@ module.exports = (db, name) => {
       .forEach((innerResource) => {
         const plural = pluralize(innerResource)
         if (db.get(plural).value()) {
-          const prop = `${innerResource}Id`
+          const prop = `${innerResource}${argv.foreignKeySuffix}`
           resource[innerResource] = db.get(plural).getById(resource[prop]).value()
         }
       })
diff --git a/test/server/plural.js b/test/server/plural.js
index 0d92232..ce0ed41 100644
--- a/test/server/plural.js
+++ b/test/server/plural.js
@@ -15,6 +15,10 @@ describe('Server', () => {
     '/articles?_id=:id': '/posts/:id'
   }
 
+  const defaultArgv = {
+    foreignKeySuffix: 'Id'
+  }
+
   beforeEach(() => {
     db = {}
 
@@ -92,7 +96,7 @@ describe('Server', () => {
     ]
 
     server = jsonServer.create()
-    router = jsonServer.router(db)
+    router = jsonServer.router(db, defaultArgv)
     server.use(jsonServer.defaults())
     server.use(jsonServer.rewriter(rewriterRules))
     server.use(router)