diff --git a/genesis/genesis.go b/genesis/genesis.go
index 5bfaba8f57..549ccc1a4c 100644
--- a/genesis/genesis.go
+++ b/genesis/genesis.go
@@ -36,8 +36,9 @@ func Read(path string) (*GenesisConfig, error) {
 }
 
 type GenesisContractData struct {
-	ClassHash       felt.Felt   `json:"class_hash"`
-	ConstructorArgs []felt.Felt `json:"constructor_args"`
+	ClassHash           felt.Felt   `json:"class_hash"`
+	ConstructorArgs     []felt.Felt `json:"constructor_args"`
+	ConstructorSelector felt.Felt   `json:"constructor_entry_point_selector"`
 }
 
 type FunctionCall struct {
@@ -78,11 +79,6 @@ func GenesisStateDiff(
 		}
 	}
 
-	constructorSelector, err := new(felt.Felt).SetString("0x28ffe4ff0f226a9107253e17a904099aa4f63a02a5621de0576e5aa71bc5194")
-	if err != nil {
-		return nil, nil, fmt.Errorf("convert string to felt: %v", err)
-	}
-
 	for addressFelt, contractData := range config.Contracts {
 		classHash := contractData.ClassHash
 		if err = genesisState.SetClassHash(&addressFelt, &classHash); err != nil {
@@ -91,13 +87,18 @@ func GenesisStateDiff(
 
 		if contractData.ConstructorArgs != nil {
 			// Call the constructors
-			blockInfo := vm.BlockInfo{} // Todo
+			blockInfo := vm.BlockInfo{
+				Header: &core.Header{
+					Number: 0,
+				},
+			}
 			calInfo := vm.CallInfo{
 				ContractAddress: &addressFelt,
 				ClassHash:       &classHash,
-				Selector:        constructorSelector,
+				Selector:        &contractData.ConstructorSelector,
 				Calldata:        contractData.ConstructorArgs,
 			}
+			fmt.Println("classHash", classHash.String(), contractData.ConstructorSelector.String()) // Todo: contractData.ConstructorSelector is being overwritten
 			maxSteps := uint64(1000000000)
 			if _, err = v.Call(&calInfo, &blockInfo, genesisState, network, maxSteps, false); err != nil {
 				return nil, nil, fmt.Errorf("execute function call: %v", err)
@@ -112,7 +113,11 @@ func GenesisStateDiff(
 		if err != nil {
 			return nil, nil, fmt.Errorf("get contract class hash: %v", err)
 		}
-		blockInfo := vm.BlockInfo{} // Todo
+		blockInfo := vm.BlockInfo{
+			Header: &core.Header{
+				Number: 0,
+			},
+		} // Todo
 		calInfo := vm.CallInfo{
 			ContractAddress: &contractAddress,
 			ClassHash:       classHash,
diff --git a/genesis/genesis_test.go b/genesis/genesis_test.go
index b668ba9a5a..ffd6bd6e24 100644
--- a/genesis/genesis_test.go
+++ b/genesis/genesis_test.go
@@ -58,6 +58,11 @@ func TestGenesisStateDiff(t *testing.T) {
 		udcAddress, err := new(felt.Felt).SetString("0xdeadbeef222")
 		require.NoError(t, err)
 
+		defaultConstructorSelector, err := new(felt.Felt).SetString("0x28ffe4ff0f226a9107253e17a904099aa4f63a02a5621de0576e5aa71bc5194")
+		require.NoError(t, err)
+		udcConstructorSelector, err := new(felt.Felt).SetString("0x1987cbd17808b9a23693d4de7e246a443cfe37e6e7fbaeabd7d7e6532b07c3d")
+		require.NoError(t, err)
+
 		genesisConfig := genesis.GenesisConfig{
 			Classes: []string{
 				"./testdata/simpleStore.json",
@@ -66,11 +71,13 @@ func TestGenesisStateDiff(t *testing.T) {
 			},
 			Contracts: map[felt.Felt]genesis.GenesisContractData{
 				*simpleStoreAddress: {
-					ClassHash:       *simpleStoreClassHash,
-					ConstructorArgs: []felt.Felt{*new(felt.Felt).SetUint64(1)},
+					ClassHash:           *simpleStoreClassHash,
+					ConstructorArgs:     []felt.Felt{*new(felt.Felt).SetUint64(1)},
+					ConstructorSelector: *defaultConstructorSelector,
 				},
 				*udcAddress: {
-					ClassHash: *udcClassHash,
+					ClassHash:           *udcClassHash,
+					ConstructorSelector: *udcConstructorSelector,
 				},
 			},
 			FunctionCalls: []genesis.FunctionCall{