diff --git a/config/protocol.mainnet.yml b/config/protocol.mainnet.yml
index acf46f8fd..66cbdddf8 100644
--- a/config/protocol.mainnet.yml
+++ b/config/protocol.mainnet.yml
@@ -1,5 +1,5 @@
 ProtocolConfiguration:
-  Magic: 5195086
+  Magic: 860833102
   MaxTraceableBlocks: 2102400
   InitialGASSupply: 52000000
   SecondsPerBlock: 15
diff --git a/pkg/config/netmode/netmode.go b/pkg/config/netmode/netmode.go
index 94a23985f..e60e8f5a3 100644
--- a/pkg/config/netmode/netmode.go
+++ b/pkg/config/netmode/netmode.go
@@ -4,7 +4,7 @@ import "strconv"
 
 const (
 	// MainNet contains magic code used in the NEO main official network.
-	MainNet Magic = 0x004f454e // 5195086
+	MainNet Magic = 0x334f454e // NEO3
 	// TestNet contains magic code used in the NEO testing network.
 	TestNet Magic = 0x3454334e // N3T4
 	// PrivNet contains magic code usually used for NEO private networks.
diff --git a/pkg/core/interop_system_test.go b/pkg/core/interop_system_test.go
index 5b763952b..fa5ffc4a1 100644
--- a/pkg/core/interop_system_test.go
+++ b/pkg/core/interop_system_test.go
@@ -46,7 +46,7 @@ func TestRuntimeGetRandomCompatibility(t *testing.T) {
 	b := getSharpTestGenesis(t)
 	tx := getSharpTestTx(util.Uint160{})
 	ic := bc.newInteropContext(trigger.Application, dao.NewCached(bc.dao), b, tx)
-	ic.Network = uint32(netmode.MainNet)
+	ic.Network = 5195086 // Old mainnet magic used by C# tests.
 
 	ic.VM = vm.New()
 	ic.VM.LoadScript([]byte{0x01})