diff --git a/types/errors.go b/types/errors.go
index a968cff5..b36a1b5f 100644
--- a/types/errors.go
+++ b/types/errors.go
@@ -9,13 +9,15 @@ const (
 	RootCodespace = "ethermint"
 )
 
+// NOTE: We can't use 1 since that error code is reserved for internal errors.
+
 var (
 	// ErrInvalidValue returns an error resulting from an invalid value.
-	ErrInvalidValue = sdkerrors.Register(RootCodespace, 1, "invalid value")
+	ErrInvalidValue = sdkerrors.Register(RootCodespace, 2, "invalid value")
 
 	// ErrInvalidChainID returns an error resulting from an invalid chain ID.
-	ErrInvalidChainID = sdkerrors.Register(RootCodespace, 2, "invalid chain ID")
+	ErrInvalidChainID = sdkerrors.Register(RootCodespace, 3, "invalid chain ID")
 
 	// ErrVMExecution returns an error resulting from an error in EVM execution.
-	ErrVMExecution = sdkerrors.Register(RootCodespace, 3, "error while executing evm transaction")
+	ErrVMExecution = sdkerrors.Register(RootCodespace, 4, "error while executing evm transaction")
 )