diff --git a/prysm.yml b/prysm.yml
index 84c3543f..9d488ee6 100644
--- a/prysm.yml
+++ b/prysm.yml
@@ -14,7 +14,7 @@ services:
         "--rpc-host=0.0.0.0",
         "--grpc-gateway-host=0.0.0.0",
         "--monitoring-host=0.0.0.0",
-        "--execution-endpoint=$EXECUTION_CLIENT",
+        "--execution-endpoint=$EXECUTION_CLIENT:8551",
         "--accept-terms-of-use"
       ]                                                                                               
     networks: