diff --git a/src/config/development-mainnet.js b/src/config/development-mainnet.js
index 69d1beb8..97d10b0a 100644
--- a/src/config/development-mainnet.js
+++ b/src/config/development-mainnet.js
@@ -4,7 +4,7 @@ import { TX_SERVICE_HOST, RELAY_API_URL } from '~/config/names'
 
 const devMainnetConfig = {
   ...devConfig,
-  [TX_SERVICE_HOST]: 'https://safe-transaction.mainnet.staging.gnosisdev.com/api/v1',
+  [TX_SERVICE_HOST]: 'https://safe-transaction.mainnet.staging.gnosisdev.com/api/v1/',
   [RELAY_API_URL]: 'https://safe-relay.gnosis.io/api/v1/',
 }
 
diff --git a/src/config/production-mainnet.js b/src/config/production-mainnet.js
index 36b8cec6..20c80966 100644
--- a/src/config/production-mainnet.js
+++ b/src/config/production-mainnet.js
@@ -4,7 +4,7 @@ import { TX_SERVICE_HOST, RELAY_API_URL } from '~/config/names'
 
 const prodMainnetConfig = {
   ...prodConfig,
-  [TX_SERVICE_HOST]: 'https://safe-transaction.mainnet.gnosis.io/api/v1',
+  [TX_SERVICE_HOST]: 'https://safe-transaction.mainnet.gnosis.io/api/v1/',
   [RELAY_API_URL]: 'https://safe-relay.gnosis.io/api/v1/',
 }