diff --git a/core/genesis.go b/core/genesis.go
index 41a36c294c..4a9f4089a8 100644
--- a/core/genesis.go
+++ b/core/genesis.go
@@ -345,7 +345,7 @@ func DefaultGenesisBlock() *Genesis {
 		Nonce:      66,
 		ExtraData:  hexutil.MustDecode("0x11bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa"),
 		GasLimit:   5000,
-		Difficulty: big.NewInt(1),
+		Difficulty: big.NewInt(131072),
 		Alloc:      GenesisAlloc{
 				addr1:  {Balance: bal1},
 				addr2:  {Balance: bal2},
@@ -376,7 +376,7 @@ func DefaultTestnetGenesisBlock() *Genesis {
 		Nonce:      66,
 		ExtraData:  hexutil.MustDecode("0x3535353535353535353535353535353535353535353535353535353535353535"),
 		GasLimit:   16777216,
-		Difficulty: big.NewInt(1),
+		Difficulty: big.NewInt(131072),
 		Alloc:      GenesisAlloc{
 				addr1:  {Balance: bal1},
 		            },
@@ -394,7 +394,7 @@ func DefaultRinkebyGenesisBlock() *Genesis {
 		Timestamp:  1492009146,
 		ExtraData:  hexutil.MustDecode("0x52657370656374206d7920617574686f7269746168207e452e436172746d616e42eb768f2244c8811c63729a21a3569731535f067ffc57839b00206d1ad20c69a1981b489f772031b279182d99e65703f0076e4812653aab85fca0f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"),
 		GasLimit:   4700000,
-		Difficulty: big.NewInt(1),
+		Difficulty: big.NewInt(131072),
 		Alloc:      GenesisAlloc{
 				addr1:  {Balance: bal1},
 		            },