diff --git a/internal/config/config.go b/internal/config/config.go
index cf1c9e3d..631cd71e 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -287,7 +287,7 @@ func (c *Config) GetRewardsSqlForkDates() (ForkMap, error) {
 	return nil, errors.New("unsupported chain")
 }
 
-type ModelForkMap map[ForkName]uint64
+type ModelForkMap map[ForkName]int64
 
 // Model forks, named after US capitols
 const (
@@ -308,7 +308,7 @@ func (c *Config) GetModelForks() (ModelForkMap, error) {
 		}, nil
 	case Chain_Mainnet:
 		return ModelForkMap{
-			ModelFork_Austin: 0, // doesnt apply to mainnet
+			ModelFork_Austin: -1, // doesnt apply to mainnet
 		}, nil
 	}
 	return nil, errors.New("unsupported chain")